MacMan is pretty useless. It's a sales gimmick to impress a boss who is buying the machine but has no clue about anything in the real world. Definitely no total power-on info in MacMan.
It has total time power is on for a job but no total total power-on time. It has a work counter but it can't be reset except by loading a new program (which also resets the power-on time for that job) so even that is useless.
It's essentially for monitoring the current job progress time (cycle time, cutting time, non-cutting time etc) and quantities in a fantasy world where virtual reality becomes reality.

The Work Counter is an option and the Hour Meter page comes with it.
No Work Counter means no Hour Meter.
I asked our Okuma sales/repair guy about it many years ago and that's basically what he said.