mattpilot,
It depends which maintenance schedule your aircraft comes under. These can vary, subject to CAA / FAA approval, for a particular aircraft, but you can't hop from one schedule to another.
You cannot normally overfly a check, so that you DO need to make sure your aircraft is is in the right place to be seen by an engineer with the required qualifications. This can be a big logistical problem at times and certainly needs to be taken into consideration if planning a long trip away from base. Certain checks CAN be brought forward, so that you can get some hours "in the bank" if you expect to be away for some time. We have to consider this on a daily basis, as we fly a lot of hours and don't always rtb at night.
As I'm not an engineer, and most of us here aren't, I suggest you post this question on the engineer's thread. Your maintenance organisation is the authority, of course.