Managed to do both modules in 5 months a few years back.
I was full time at home with the objective of clearing the exams a.s.a.p owing to monthly mortage etc.
Basically worked 9-5 monday to friday progressing through the course content, then a few hours after dinner working on progress tests and revising that day's material. Then at the weekend, spent one day revising that week's work then the other revising one of the previous weeks work (didn't want to get to the end and realise I had forgotten everything from earlier on !)
This way it took 5 weeks to work through each module content. I then allowed a few weeks revision before attending each brush up session at Bristol.
Managed to get through all exams first attempt, but it took a lot of discipline. However, I found that once I was a few weeks into the regime, it just became a fairly natural way to spend my days.
Hope this helps anyone just about to take the plunge.