I've gone over two weeks for sure. I don't like taking them very much honestly, I only do if my parents start complaining about the smell (I sweat a shit ton doing nothing) or if I have to go somewhere public. Which means a shower every weekday for school (actually I sometimes just do the sink shower and just get my armpits. I'm almost anti hygiene, I don't think I've brushed my teeth in months, but I never seem to get cavities.