I'm presuming he has use of his arms? If so, he can do much for himself. (i've been there and been worse, so I know)

Leave him lunch at his bedside in a cooler - that way he can feed himself and you don't need to come home. You can just check up on him with a phone call. (this way you can get a ride in before work, get to work a little later and not take a 2 hour lunch)

He also shouldn't need a sponge bath everyday - probably more like once every 3-4 days. Even being non-weight bearing and only having use of one arm, I managed to sponge bathe myself (as long as some got me the supplies/water and took them away). This will give you some extra time each day to sneak out for a short ride.

Think in increments of shorter rides - aim for 30 or 45 minutes - this way you can sneak them in and finish off any remaining time indoors.

I hope he heels well!!