After 14 years of not flying, it took me about 5hrs to get the PPL in the UK. Granted, this was probably a little bit "generous" by the combined FI/Examiner.
When I got to the US to do my FAA license they started right at the bottom of the syllabus and then it took about 20hrs to get up to speed on it all and flying in a new airspace. So somewhere in between probably lies the correct amount - mentally prepare for 10hrs and I think you'll come pretty close.