Mine was a bit different from yours, but should apply.
I talked to my surgeon before the surgery and scheduled both procedures. The first was in late August, the second in late November. In my discussion with the surgeon, he felt that since both were essentially bone on bone, there was no plus to waiting any time.
As to doing both at the same time, he didn't do that, so that was out. Three months in between seemed reasonable. His timeline for me had me driving in two to three weeks, on crutches beyond five or six weeks, then just walk and strengthen.
I decided not to wait, despite my work asking me to defer the second by a year. I was heading a critical project for them and they wanted me not to take the five weeks I did. It was the best decision for me in that the time in between seemed to be enough to fully strengthen the joint and begin on the muscles, and my first leg/hip benefited from the physical therapy from the second.
Financially it was much better, since I paid only about 400 for both procedures; had I waited a year, my medical insurance changed at my work and I would have needed to pay 20 % which would have meant about 20,000. I think once you know it's the right decision, it's better to move with considered speed.