Hi there,
I earned my PPL over 8 weeks with the Air Cadets. It is certainly "doable," but takes a huge commitment as clunkdriver alluded to.
Here was our schedule that allowed us to do this (with minor variations in the case of cross-country flights):
0600 - Reville
0615 - PT (3 mile run) - for fun, not part of the program schedule
0730 - Breakfast
0800 - 1145 - Ground School
1200 - 1245 - Lunch
1300 - 1400 - Pre-Flight Briefing
1400 - 1530 - Flight Lesson
1530 - 1630 - Post Flight De-Brief
1700 - 1800 - Dinner
1830 - 2100 - Free Time (Study Time)
That was our schedule Monday to Friday. Saturday was set aside as a clean-up and weather day in case things got missed during the week. There were also two full days of ground school: one prior to the PSTAR and one prior to the PPL Exam. Some of the guys and gals were reversed (flying in the morning, ground school in the afternoon), but you get the gist.
Sunday was always a "day off," but most of us used it as a communal study time.
If you think the above schedule is realistic for 8 to 10 weeks, then yes it's doable. But take note that you won't have time to see your family and you'll have to take all that time off work. Plus, most of us had taken some form of Ground School for at least 2 years prior as part of the scholarship requirement and some had Glider licenses, so the ground school was not "new."
It'll be a challenge for sure if you don't have any aviation experience, but well worth it!