He has had two months of 'rehab'. = He has been/gone through two months of 'rehab'.
It could take him several months to 'rehab' his knee.
They're planning to 'rehab' that old building.
(..) You're in my heart, Maddy. Goldie's dad claimed he shot himself. It was just stupid enough, the police believed it. He got Goldie into rehab, worked things out with her eventually. I've traveled since. Half the world. Art museums, bus stations, airports. (..)1996 Foxfire
(..) - She's in trouble. We need $ from you to help her. What in the hell has she done now? It's for rehab. Goldie has a drug problem. - What are you talking about? - She's sick. You tell me where she is, (..)1996 Foxfire