Don't rush the process of bonding two rabbits. Some rabbits are more territorial or hormonal than others, so there's really no amount of time that a bonding should take. I'd say in general, a successful bonding relationship is developed in about a month, with a meeting twice a week.
I haven't had a need to bond a pair of rabbits as of yet. But if I do, this is the method I would use. It's a process; there are 3 steps. Let each step take as long as you need it to be. Don't move on to the next step until you feel like your rabbits will be able to handle it.
These steps are indicating that you want a pair of bonded house rabbits. Modify this process to fit your individual rabbits and individual needs.
STEP 1: SMELL
Have your resident rabbit roaming the house as always. Have the new, second rabbit behind a closed door in another room. Have it in a room the resident rabbit passes often; that way, he or she will almost always be smelling the rabbit. This is so that when the rabbits are introduced to each other, the resident rabbit is already used to the new rabbits' scent. Use this for about a week.
STEP 2: SMELL & SEE
Put the new rabbit in a cage for the time when the resident rabbit will be in there. That way, they can't touch each other, and if the new rabbit needs to get away he can. Open the door to the room your new rabbit is in. Allow the resident rabbit to check out the new rabbit. He should seem interested in the newcomer. If he ignores it, that's progress. If he gets agitated or tries to scratch/growl at the new bunny, or if the new bunny does that to the resident, go back to step one. Do this for about 2 weeks.
STEP 3: SMELL, SEE & TOUCH
This step will take longer than the other two and DEFINITELY should not be rushed.
Put the two in a place where neither of them have been before. This is the "neutral zone". Because neither of them recognize the scent or sights of this new place, they won't be territorial over it, and will be more concerned with checking things out than with terrorizing the other rabbit.
If fighting or humping occurs in the rabbits, separate them, let them cool down, and try again in an hour or two.
Do this every other day for several weeks. Like I said above, this is a slow process. Never leave them unattended. Wear gloves if you think they might get a little nippy.
If your new or resident rabbit grooms him- (or her) self while they're together, that means they are warming up to each other. Rabbits won't groom themselves if they are uncomfortable about their surroundings or who they are with. Once they start grooming each other in the "neutral zone", you can move on to having them together in a zone known by either or both of them.
In that zone, there probably will be humping going on. Let it happen, unless fur is being pulled out and they are being bitten. Dominance needs to be established, or else nothing will be accomplished.
Have you successfully bonded two rabbits together? What method did you use? I would love to know! EMAIL ME!