Like January, February is a good time for visiting Japan as the weather is usually sunny and dry and sightseeing spots are not crowded. The downside of a visit in winter are the relatively short days (sunset is around 5:30pm in Tokyo) and the vegetation's barren state.
1 A healthy person drinking approximately 2 liters of water per day makes 800 to 2000 ml of urine per 24 hours (4).  If the urinary system is healthy, the bladder can hold up to 16 ounces (2 cups) of urine comfortably for 2 to 5 hours (5).
I first started wondering about how long after a drink of water does it take to enter the bodyâs system after realizing I was feeling dehydrated and was about to go play volleyball. I didnât know if drinking a glass of water right then would help when I was about to play a sport an hour later. I know that you should drink â8 glasses a dayâ, but if youâre feeling dehydrated, or if you just worked out and your muscles were feeling fatigued, how long does it really take for that first mouthfull of water to help?