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).
PASSING WATER: One hour. On average, it takes an hour for liquid to be absorbed through the gut into the bloodstream, then filtered by the kidneys and sent to the bladder as urine, says Rowland Rees, consultant urological surgeon at the Royal Hampshire County Hospital, Winchester.