There are "levels" of bonding, from what I've read on here. I consider "bonded" the point where they will come to you and not away from you, and when they are comfortable with your skin and no longer crab or bite.
So, for my two boys, that was about a month. However, one seems more "bonded" because he treats me as comfort to him, loves to snuggle, etc. The other sort of tolerates me, and I don't think that will change. Just personalities, like friendships.
I'm in the process of bonding to a female now, it's into week two and she's coming along, though not as quickly as the boys because she was 8 months and neglected before us and we got our boys at 4 months as their first owner. But with her, I expect it may take longer.