It took me 3.5 hours to go solo and be signed off in a C172, which with the paperwork got me the RPL. I then continued and did the PPL, which was mainly just controlled airspace and navigation again. Even though I had the navigation endorsement I needed to be on a PPL standard and in reality I was rusty. It took about 15 hours. It will depend on you, some do it in very little, I took a bit more as I retrained in many things.