Is there such a thing as 727 Open Time?
Only if you ASBY!!
You can slide R-Days and put six in a row (Crew Sched will not permit the addition of more than six days; it is permitted if originally awarded); that way you will have 12 days.
Then drop three R-Days.
That leaves 4:30 x 3 = 13:30 in your make-up bank. (Note: it is not 4:38 added to your make-up bank, per the contract, but 4:30).
13:30 can be turned into 3 trips at 6 hours each -- 3 am hub turns in a row would make life better. Let's see, right seat of the Boeing, no open time available to even try and put 3 hub turns together. Personally, I would try a Sunday-Monday for 8:00ish credit, then a hub turn and that would put you at approx 14:00ish credit.
One poster noted that you can go 6:00 in the red with make-up; if you try 6:01, it will be denied, so pick the trips carefully if you haven't dropped any days as of yet.
As the month progresses, pilots drop due to various reasons and *sometimes* there is open time available during the later part of the month.
FYI: best time to pick up make-up is during the first week of the month.
Good Luck.