depends. at home, anything more than 20 minutes and my mom will turn on the kitchen tap and i'll have to finish up my shower with freezing cold water :x
if im at my grandma's i cant take more than 10-15 minutes.
if im a someone's place and i no like that person, i take up to 30 minutes or more.
around 10mins for shower... and 45mins for bathetub
around 10mins for shower... and 45mins for bathetub