It entirely depends on the individual rabbit, but a male's hormones have normally subsided at about 4 weeks after neuter.
Bunny's have been bonded when a female remains entire, but it's not really a good idea unless there are specific medical reasons why you don't want to neuter the lady.
Neutering the female will make her calmer and will also stop her from having phantom pregnancies. If you allow her to be with a male bunny, despite being neutered, he will still try to hump her and this will make her ovulate (lady rabbits don't have cycles like humans, the female will ovulate whenever she is stimulated) This will mean nest building and normal pregnant rabbit behavior such as aggression if you go near the nest etc.
Plus of course unbonded girl bunnies will most likely succumb to uterine cancer.