Yes it is possible, I did mine in 5 months. The hardest part was definately Mod 1. I did mod 1 in 3 months and then mod 2 in 2 months, this was the time from starting the course work to sitting my last exam. Don't get me wrong it was very hard work and you pass the exams 1st time but it is possible. Certainly by the time I got to the Mod2 revision course I knew what was involved and was better prepared. I know when I started Mod1 it was all very daunting and I didn't know what to expect etc but by the end it certainly becomes easier and possibly why you can do the 2nd module quicker. I think the average though is between 6-12 months but I do know a giy that sat his mod 2 exams the month after his mod1 so anything is possible
And as Roy Castle used to say
"Dedication oh, oh, dedication oh, oh , dedication, that's what you need.
If you want to be the best, soar above the rest.
Who-oh Dedication's what you need" :-))