@kitten701 Well, it is a major surgery. And a good revision surgeon will open the area enough to take a good look at the condition of the bone behind the cup and the rest of the prothesis, so the incision has to heal, as well as any muscles and tendons they move.
That said, replacement of the cup (and maybe the ball if it has worn) don't require the trauma to your bones that happened in the first surgery.
So, if it is uncomplicated, expect an easier time of recovery. I had a revision complicated by damaged tissue, and even with cleaning that up, I had an easier recovery than the initial replacement.
If the pain has affected your lower back, be sure to get a rehab order that covers dealing with the back pain - probably some gait evaluation and strengthening exercises for that as well as your leg.

Good luck! I know how disappointing it is to have to go through it all again!