If the machines are well maintained with Ricoh supplies and parts and kept at the target volume, they (ours) generally go from PM to PM. Maybe 1 call in between.
But is for instance a Gest 5502 is run at 2k a month, you will be there a half dozen times for CQ/Jams. Or a 2212 at more than 25K and you'll be clearing jams and replaceing fuser a half dozen times between PMs.
Generally, these machines rum very well. Also I hve noticed that if the morale in the office is low the mchine takes the heat.