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).
My doc said to drink 1 litre or 32 ounces of water one hour before the appointment time.   I'm a white male 42 year old, and havecontinuous UTI's and sometimes at the end of my urine stream there is air bubbles that comes out, no pain just air. Fluids. about 20 min.