How long should you give it?
I put up with an uncomfortable grip on my custom recurve for a little over a year, which was about a year too long. Yes, I took the rasp to it. Hey, it's my bow, I might as well make the grip feel right. No one else knows how it feels except me.
My next new bow was a longbow. I didn't fool around too long trying to get used to the grip. I reworked that grip within a month.
It depends on the situation and the bow whether on not I reshape the grip. There is definately a pucker factor to deal with when you make that first pass with the rasp!