user8827: I'm playing lots of online chess. I find one thing in particular really hard: time. I lose on time a lot. Yesterday and today I lost 3 times pure on time - games where I would've destroyed the other if it wasn't for the time - but since I keep on thinking too long about certain situations it takes a lot of time.
I play mostly 10+0 matches. I know I can play longer games; I just want to know how I can improve my time 'problem' so I can also play shorter games.

user20406: I know this is an old question, but online chess and over the board chess for blitz, lightning and sometimes quick games are not the same type of game. I shall explain why.
Premoving a skilled player in lightning and blitz as the clock runs down will bite the honest skilled player much more than a less skilled time player with low rating. It will never reflect their weaker over the board play. 
The first big reason is that we get to see them pick up their piece and make a bad sac. The idea of “bishop takes pawn for zero compensation followed by premoved castling" will never happen in over the board. It only happens in online lightning time scrambles.
This alternate playing style allows a less skilled player to play in a nonsensical fashion and refute your premoved skill play. Over the board play, on the other hand, makes a decent player unable to premove without fearing premoves and quick rating loss.
I am master level chess player, and yet I’m a 1900 rated online lightning player. Over the board lightning players I crush are people I know, and they beat me online doing the same thing. 
If both players do not use premove, the contrast between not seeing a piece touched and moved to a square and the time delay to place it on the a square makes a large difference.
The next big reason is the mouse move. The speed of the Internet connection, such as lag like on  chess.com (where I’m rated 1900 in lightning and 2240 in blitz), the piece I move delays as it hesitates every singe move. 
In conclusion, do not view quick online chess as anything comparative to quick over the board games, as they truly are NOT the same thing. The longer the game, the more comparative to over the board it becomes. End rant here. :)

user7897: I'm not sure if this will work, but have you considered playing much shorter time controls, and then going back to 10+0?  I have noticed that if I play 1+0 "bullet" on lichess, and then play 5+0 "blitz", it seems easier...

user12540: If you want to play a 10 min format and you are unable to cope up with time I would suggest first check out in which phase you are taking more time . Are you thinking long in the middle game, trying to do deep calculation and finding the most perfect move? Then do not think in that fashion! Try finding an easier move instead, which is safe. It is important that looking at the position you can make some moves using your instinct and not calculating every move. 
You should also keep track of your Opponent's time & try flagging your opponents. Also practice games where you always have a time advantage. What I mean here is you would always have more time on clock compared to your opponent. You play chess not only to checkmate your opponent but to have a time plus on clock.
One more suggestion would be always practice at shorter time controls before you play in the original format. For instance play 5 min, 3 min or even 1 min games so that when you return to 10 min it feels easy.

user7657: You have to become good at slow play before you can graduate to blitz.  You learn very little in the fast games, and if that's all you do, you'll never really progress.  The great players like Fischer were strong at blitz, but only after they were nurtured on classical play and really understood chess.

user-1: 
I know I can play longer games; I just want to know how I can improve my time 'problem' so I can also play shorter games

My advice is not going to address how you can speed up your thinking or improve your clock handling skills. My advice is to play longer games.
I personally cannot think quick enough for bullet or blitz chess. My 'home' is rapid play or slower. The slower time controls also suit my more positional style and a preference for the endgame.
When it comes to time controls, choose the time controls that suit you and your style, otherwise you are going to go against your grain and become frustrated.

8827: <p>I'm playing lots of online chess. I find one thing in particular really hard: time. I lose on time a lot. Yesterday and today I lost 3 times pure on time - games where I would've destroyed the other if it wasn't for the time - but since I keep on thinking too long about certain situations it takes a lot of time.</p>

<p>I play mostly 10+0 matches. I know I can play longer games; I just want to know how I can improve my time 'problem' so I can also play shorter games.</p>
 20406: <p>I know this is an old question, but online chess and over the board chess for blitz, lightning and sometimes quick games are not the same type of game. I shall explain why.</p>

<p>Premoving a skilled player in lightning and blitz as the clock runs down will bite the honest skilled player much more than a less skilled time player with low rating. It will never reflect their weaker over the board play. </p>

<p>The first big reason is that we get to <em>see them pick up their piece</em> and make a bad sac. The idea of “bishop takes pawn for zero compensation followed by premoved castling" will never happen in over the board. It only happens in online lightning time scrambles.</p>

<p>This alternate playing style allows a less skilled player to play in a nonsensical fashion and refute your premoved skill play. Over the board play, on the other hand, makes a decent player unable to premove without fearing premoves and quick rating loss.</p>

<p>I am master level chess player, and yet I’m a 1900 rated online lightning player. Over the board lightning players I crush are people I know, and they beat me online doing the same thing. </p>

<p>If both players do not use premove, the contrast between not seeing a piece touched and moved to a square and the time delay to place it on the a square makes a large difference.</p>

<p>The next big reason is the mouse move. The speed of the Internet connection, such as lag like on  chess.com (where I’m rated 1900 in lightning and 2240 in blitz), the piece I move delays as it hesitates every singe move. </p>

<p>In conclusion, do not view quick online chess as anything comparative to quick over the board games, as they truly are NOT the same thing. The longer the game, the more comparative to over the board it becomes. End rant here. :)</p>
 7897: <p>I'm not sure if this will work, but have you considered playing much shorter time controls, and then going back to 10+0?  I have noticed that if I play 1+0 "bullet" on lichess, and then play 5+0 "blitz", it seems easier...</p>
 12540: <p>If you want to play a 10 min format and you are unable to cope up with time I would suggest first check out in which phase you are taking more time . Are you thinking long in the middle game, trying to do deep calculation and finding the most perfect move? Then do not think in that fashion! Try finding an easier move instead, which is safe. It is important that looking at the position you can make some moves using your instinct and not calculating every move. </p>

<p>You should also keep track of your Opponent's time &amp; try flagging your opponents. Also practice games where you always have a time advantage. What I mean here is you would always have more time on clock compared to your opponent. You play chess not only to checkmate your opponent but to have a time plus on clock.</p>

<p>One more suggestion would be always practice at shorter time controls before you play in the original format. For instance play 5 min, 3 min or even 1 min games so that when you return to 10 min it feels easy.</p>
 7657: <p>You have to become good at slow play before you can graduate to blitz.  You learn very little in the fast games, and if that's all you do, you'll never really progress.  The great players like Fischer were strong at blitz, but only after they were nurtured on classical play and really understood chess.</p>
 -1: <blockquote>
  <p>I know I can play longer games; I just want to know how I can improve my time 'problem' so I can also play shorter games</p>
</blockquote>

<p>My advice is <em>not</em> going to address how you can speed up your thinking or improve your clock handling skills. My advice is to <strong>play longer games</strong>.</p>

<p>I personally cannot think quick enough for bullet or blitz chess. My 'home' is rapid play or slower. The slower time controls also suit my more positional style and a preference for the endgame.</p>

<p>When it comes to time controls, <strong>choose the time controls that suit you and your style</strong>, otherwise you are going to go against your grain and become frustrated.</p>
