choosing return flight after f2f

Hello! I was just invited to the f2f yesterday after my 1:1! I’m trying to figure out the best return flight time back home. The email specified to book a return flight after 6pm and the only nonstops back home are at 6:10pm or 6:15pm. What time was the F2F done after getting a CTO? I don’t want to miss my flight getting home, thanks in advance.