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).
How Long Does it Take for Water to Evaporate? On June 12 at noon, I filled a wine glass with 8 oz. of water. Then I put the glass outside, where it would be in the sun for a few hours every day. I'll post the answer, but I'd like to hear your guess right now. Closest answer wins!