Assuming on a Par 72 there are 10 par 4’s, 4 Par 5’s and 4 Par 3’s then the course can have 14x2 + 4x1 = 32 Flights on the course.
If the organisers allow 10 mins per flight - which the PGA does - at the Start Box then the round time is predicted to be
32 Flights x 10 mins = 320 mins = 5 hours 20 mins.
Therefore the pace is already set at the Start Box - unless everyone conveniently speeds up and gets off the course ahead of schedule.
Maybe the organisers should set the Start times at 8 minute intervals which would give a round time of 4 hours 15 minutes - as most european clubs do.
Or even better every 6 minutes equating to 3 hours and 12 minutes