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
Depends on the season and general activities. Basically the colder I am and the less I do in them the more I wear one, up to about five days or so. 

Summer/high activity about two days, maybe 3 max because sweat is awful. Sport-bras only once.