I usually wear mine for a max of 5 days before I remove it. I give my head a break overnight and then reapply.
I do retouch the edges everynight with a drop of glue here and there .. otherwise the hairline would start to look fake and odd.
I use tape to actually get the unit on and the tape would definitely keep it on for 2- 3 weeks at least I am sure ... but the thing is, your own hair starts to get funky and/or the unit starts to get funky somewhere within that first week
so when you turn your head quickly ... people can smell it.
Outside of that I like to unit to be fresh and well moisterized so it can hang nicely and not look burdened and stiff with creams to give it moisture etc.