My experience to date would indicate that it is rare to arrive at the hotel prior to within +120 min of on blocks time. In addition whilst the scheduled report time is 75 min prior to departure the actual time required to check out and catch the bus is 145 min. The upshot is that approximately 4 hours of layover time is simply not available for rest even if you do arrive on time.
The FRMS also doesn't take into account the fact that you've been bounced around all the way to/from the airport on those disgraceful US expressways. You arrive at work literally shaking from the bus ride....and that is without any scares on the expressway.