At most airlines you can swap to basically whatever you want as long as you're within 117 rules and meet the reserve coverage requirements of your company(often called bad day/worse day). Last month I did 3 4-day trips, a day trip, a 2 day, and a 3 day.

My schedule this month initially had 4 day trips in addition to my vacation week. I was sick of being away for 4 days at a time so, with the exception of one I liked, I swapped my 4 day trips down to mostly 2 day trips and a 3 day and a 1 day. In the process I also picked up additional days to fly more and make extra money. It helps tremendously that I like in base. In the end I would up with 13 days off. Longest days off block I have is 4.