waxing

just got a new board, Burton Fish, and wondering how long everyone usually leaves their wax on for the first wax of the season?
how about the first wax when you get a new board? does it make any difference?
i usually leave my wax on for about 8 hours and then scrape it off.

please advise me, i dont wanna mess up my new board before the snow has even fallen!!!

thanks in advance