Recently (Nov) done a IAD-PTY-MVD.
The connection time is 1 hour 17 min, if I remember correctly. (give and take 10 min)

The first leg on time arrival. I just need to walk from one gate to another gate, no further security screening. But the walk is about 10 min if walk and small run.
I know I have time to look around the terminal, but too short to visit the lounge, so I just take my own time and pace.

I reach the gate about 50 min before departure, and they have started boarding. Board the flight, on time departure.