Back when the minimum for issue of a PPL was 35 hours, I completed the syllabus in 31 hours (then did 4 hours revision before I could take my GFT) and about five weeks, taking so many days purely due to days lost through poor weather. I attended 5 days per week.
This was in November and I already had about 40 hours gliding which didn't count for a reduction in hours as I didn't have a Silver C Certificate.