I took me about 4 months to complete the PPL (ground school and flying, from intro flight to flight test, about 60 hours flight time, ground school 2 nights a week) while I was working about 20 hours a week on other things. I found that flying two to four times a week (at about 2 hours per flight) was the best pace to keep learning and yet have time to absorb the knowledge. This was in spring and early summer (April through July) when the weather is generally good. I could have managed it in three months as I had four weeks of business travel during the training period. It seems to me that two months is somewhat of a short time but three is reasonable.