user17894: The Wikipedia page about Chess Time Control describes for example:

... 90 minutes for the first 40 moves ...

A move in chess is defined as both White and Black side doing their separate move, so if the 90 minutes are per side, then the Wikipedia description appears to be misleading.
This applies also to the World Chess Championship 2018.
Are these 90 minutes per side, or total ?

user7297: Time controls are always specified per side, so White has 90 minutes and Black has 90 minutes, for a total of 180 minutes (for the first 40 moves). See the FIDE handbook:

6.3.1 When using a chessclock, each player must complete a minimum number of moves or all moves in an allotted period of time including any additional amount of time with each move.

It says 'each player', not 'both players'. It's probably not worded more elaborately since it's 'common knowledge' among competitive chess players.

17894: <p>The Wikipedia page about Chess <a href="https://en.wikipedia.org/wiki/Time_control" rel="nofollow noreferrer">Time Control</a> describes for example:</p>

<blockquote>
  <p>... 90 minutes for the first 40 moves ...</p>
</blockquote>

<p>A move in chess is defined as both White and Black side doing their separate move, so if the 90 minutes are per side, then the Wikipedia description appears to be misleading.</p>

<p>This applies also to the <a href="https://en.wikipedia.org/wiki/World_Chess_Championship_2018" rel="nofollow noreferrer">World Chess Championship 2018</a>.</p>

<p>Are these 90 minutes per side, or total ?</p>
 7297: <p>Time controls are <strong>always</strong> specified per side, so White has 90 minutes and Black has 90 minutes, for a total of 180 minutes (for the first 40 moves). See the <a href="https://www.fide.com/fide/handbook.html?id=208&amp;view=article" rel="nofollow noreferrer">FIDE handbook</a>:</p>

<blockquote>
  <p>6.3.1 When using a chessclock, each player must complete a minimum number of moves or all moves in an allotted period of time including any additional amount of time with each move.</p>
</blockquote>

<p>It says 'each player', not 'both players'. It's probably not worded more elaborately since it's 'common knowledge' among competitive chess players.</p>
