How long is too long?

So .. a little TMI. My man has a groin I jury due to the sport he plays. He has had it for awhile and it hasn't gotten any better. We also havent had sex in over a month because of it. And it really sucks. I have a very high sex drive I could have sex everyday lol - him on the other hand .. complete opposite. And now it's even less with the groin injury. Send help SOS lol