What if 15 minutes is too short? I don't think that's long enough for a good bath, and I can't feel refreshed.

What if 15 minutes is too short?
I don't think that's long enough for a good bath, and I can't feel refreshed.
15分は短すぎたら？お風呂につかるのには十分じゃないし疲れが取れないと思う。