The research that I have done and sorry I can't find the link (this was research on partial and full gastrectomies for ulcers and cancer not just the VSG). It takes up to 3 months for the scar tissues to fully grow over the staple line and basically seal it.
A leak can develop during that time so I made sure not to eat anything like seeds and strawberries and kiwis and popcorn as to me those things can get lodged in the staple line.
I have seen someone as far as 3 months out whose leak was found, now it could have developed before that, but from what I remember the body developed like a pocket where the leakage was being stored so it wasn't leaking directly into the body cavaity.
"WLS is only for people who are ready to move past the "diet" mentality" ~Alison Brown
"WLS is not a Do-Over (repeat same mistakes = get a similar outcome.) It is a Do-BETTER (make lifestyle changes you can continue forever.)" ~ Michele Vicara aka Eggface