system
A chat on subreddit /r/NoStupidQuestions
human
One day/24 hours. 

The real question is, for people who wear bras, how many days do you wear them before you wash them (not consecutively necessarily lol)
gpt
I use the age-old test- smell. If it smells fine I figure it's still good. If I can smell BO I figure everybody else can, too. into the sink they go.