fertility after neuter

hypo was neutered almost 4wks ago and i want to start introducing them slowly but want male sure its safe?will he still be fertile?

I always wait 6 weeks just to make extra sure.

I'd leave it another 2 weeks. Apart from anything else he'll still have hormonal 'urges', which could cause problems if you try to bond now.

I think it's safe to say he's not fertile anymore; however if you want to be on the extra safe side wait another couple weeks.
I introduced Mango to Maia only one week after he was neutered, but she was already spayed. However, he did try to hump her for a while and only after he stopped did they become friends.
So if your rabbit still tends to hump his partner (in a sexual way and not as a display of dominance), wait a little while more.