I tried to do it flying once or twice a month and it just didn't work....got to the point of solo and then got busy again. Finally I got sick of it and quit work to focus on flying. Finished up in less than two months after that and found learning much easier flying several times a week. I had over 60 hours when I did my checkride but had to wait a few weeks on the DPE so I cruised around by myself every day I could.