It took a month for the CPL part time, not 2 to 3, that was for the whole CPL/ME/IR, just double checked my log book! Looking at it theres no real pattern, daily flight totals ranging from an hour to about 3 hours. The maximum I didnt fly was 9 days which was probably a combination of weather and available slots (but then's a good time to utilise the sim), but then one week I flew 5/7 days. Allowing a month and a half should be plenty.
They let me drop to 30 hours a week at work (essentially 4 day week) but at my discretion. Days I knew I wouldn't fly I'd go in early, have minimum lunch and leave late to make up hours, quite often 10 hour days.