The Cancun turns are credited at 7 hours and Punta Cana is right around 8. I don't know if it's just PIT, or the entire Allegiant system, but the block times seem to be unusually tight, so going over block/credit is pretty common. I was getting around 7.5 for CUN and 8.2ish for PUJ. Throw in deicing and you'll be pretty close to 117 daily flight time max.

Thurs and Sunday are PUJ turns and Fri, Sat, Monday are CUN turns (both starting at 6am, finishing around 4). As was said, yes they are year round. And as I mentioned before, they usually go to the top 1 & 2 pilots in base.