I'm a Dad. My wife suggested I post here as I had this done as an adult too.
I was told I'd be back in action in about 3 weeks but that was wildly optimistic because it really hadn't properly healed by this time and was still subject to occasional, light bleeding. Using a condom for sex did get around that problem however. Six weeks seems more realistic.
Not sure what medical issue your DH has, mine was a foreskin that was too tight and could not be pulled back so after the op was the first time him down there had been exposed to the outside world.
As such, walking around was a nightmare, not painful as such, just super SUPER sensitive. It need only brush or catch my underwear a bit to cause a powerful, and not particularly comfortable, sensation. Thus, I probably walked funny for a while. Awkward really since I lived in London and walking around the outside world & through tube tunnels was all I did. I do recall a few times actually laughing at my temporary disability as I struggled to walk around with some level of dignity intact.
I don't really know what sex is like for a man whose foreskin performs as it should so I'm perhaps not the best person to truly compare before and after. From my point of view, being circumcised is SO much better than having a dysfunctional foreskin with the hygiene paranoia and sexual difficulties that brought (penetration without a condom could be painful and not easy to achieve).
I also can't really comment on whether I last longer or not as I cannot compare like for like because I've not worn a condom since healing whereas before the op, I always did. All I can really say is that I understand the anxiety before the op, the recovery period was uncomfortable and could not end soon enough BUT it was one of the best decisions I ever made. Him down there works very well these days, sex is wonderful, I never found wanking to be an issue and my wife doesn't seem to have any difficulty working with it at all.
I've read people say lube helps with wanking but we've never needed to bother with that. I am very happy with what I have today, I don't think you or your husband have anything to worry about.