That just depends on you, I believe. Usually I like to put a pretty large maintenance cycle in-between a cut and bulk cycle.
Absolutely, you never want to immediately follow a bulk cycle with a cut cycle. You will lose a lot of that hard earned mass. A maintenance cycle allows your body to get used to the extra weight and this will help to preserve mass during the cutting phase. I usually do 8-12 weeks on a bulk...then ride the maintenance wave for at least that long, then cut. Works for me anyway.