It's too small to be relaxed inside. Ok, back to how to take a bath in Japan. First, take a shower to wash off the dust briefly, and then go into the bath tub as long as you are satisfied. Sometimes go outside of it and wash your body, hair, or anywhere you want to, and back to the bath tub as often as you want. Be careful not to bring bubbles with you, for the hot water must be kept clean.
Most Japanese people change water once a day, after all family members finished taking a bath.
I love pouring bath salts, perfumes, or anything available into the bath tub. Please Say Hello on my guest book, or tell me your URLs.