Did mine at Ad-Astral a few years back. For the first half of the rating, which was mostly on the sim, i was only doing 1 lesson a week, even once a fortnight sometimes. All whilst employed fulltime as a pilot. It didn't hurt, especially prior to each new sim lesson I went on microsoft flight sim to revise on procedures and scan.
Once we were in the aircraft, then tried to fly every second to third day so as i didn't overload my poor alcoholic affected brain too much. Used off days to review prevoius flights and prepare for the next.
Even now everytime a renewal comes up I just jump on the good old flight sim to brush off the cobwebs. Just come prepared
Cheers
Inthesoup