Does your husband give a date for when he thinks he'll be healed enough? It's fine for him to set boundaries about when he wants to be sexual, but they should be clear ones that are easily understandable. If he's just giving a vague 'I am still not at 100%' then I'd be wondering whether there was some other reason he is avoiding sex. Particularly if you've offered to do things that won't be strenuous for him. Perhaps some rift he feels with you, or something personal he's dealing with, or maybe medication killing his sex drive. There can be dozens of reasons for someone to lose interest in sex. My best suggestion is to have a non-confrontational, compassionate conversation about it with him.