I guess it's where you grew up. I grew up in my grandparent's 1920 house, where my grandfather had a custom made, extra long bathtub put in. (I can lie down in it completely. He was over 6 feet tall, tall for the day.) My dad was born in 1920, my mom in 1923. Both said they bathed daily. BUT my mom said she only washed her hair once a week, because she had to set it in pincurls. So it was typical to wash your hair on Fridays. She also said she frequently went to work with her hair in pincurls, with a "do-rag" on them....and it was not an uncommon sight in those days.