Yeah dude each attachment i've had has lasted longer and longer. It has everything to do with prepping your scalp and how you apply the tape. I was hating on supertape but it got me 5 days in my final attachment. I had to take it off because it was itching the hell out of me after 5 hours of football and it left my scalp abit red but i suppose thats body chemistry. Whenever it comes off i have to wash it.

i dont know what surgery you're having done mate but goodluck. Your head will be covered with a plasticy haircap thing during the procedure and taken off without you realising. But something like that will make no difference to your attachment. Now other than extreme sweating which i doubt i think you'll be fine. Just put the piece on when you're ready.