You can only tell if you put all these info on a calendar. I downloaded a template for a calendar and populated it with all info that I wanted. Only then and based on my personal commitments, was I be able to tell if is reasonable plan or whether I need more or less time. You can schedule Rita's chapters, you can include days for watching videos over youtube, days to solve questions on the net, reviewing the PMBOK, practice brain dumping, and so on.
It might take an hours or so to sit, think, and fill the calendar, but it's extremely useful committeent tool.
I'm still on it and didn't finish ... so good luck to both of us any everyone else too..