Repetier Host / Slic3r calculates how much filament pretty accurately (last time I checked mine it was spot on). Yes the output on the Orion/Max is indeed miles out, not sure
why but could be due to retractions not being accounted for correctly? mine was over stating by 2-3X back calculating from ABS density, weight of object printed and filament diameter.
Ultimately both the sum total hours printed and sum total meters of filament used are pretty pointless stats other than you could use them for service intervals
but you can easily get at this info as it's stored in the Eeprom which is accessible from Repetier Host & Matter Control anyway.
I was considering doing a mini summary guide to updating/modifying the Orion/Max UI but clearly I'm concerned if people brick their Rambo's so I've not done it yet
and the info so far is not a step by step but brief code changes aimed only at people already comfortable already flashing their Rambo's.
It's nothing difficult nor does it require any real coding skills just a bit of understanding how the LCD works and how it's addressed. However someone could accidentally
edit the wrong section of code.... or turn the thing off mid update (flashing the Rambo).. however there is roughly the same risk as flashing an update... anything else you can
always go back to the original file from SeeMeCNC downloads.
Max users who built their own machines will have no issues as they will have edited the code and flashed their Rambo's during their builds anyway...
I've personally made 3 Basic changes.
1. Main Screen has increased info on it.
2. Totals page replaced with positional Info and repeated info from main screen.
3. I moved the Home towers command away from the Flow and Speed multipliers... Jeez who hasn't accidentally homed mid print... moving prevents it.

- 1. Main Screen Mods Heater Powers and Cooling Fan added

- 2. Replacement of Totals Page XYZ etc
REMEMBER: If you download and flash your Rambo with the default file from SeeMeCNC you'll have to check/reset your Motor Currents (Discussed already extensively on the boards where and how)
There are numerous other things you can display but none of them were particularly useful IMO that I didn't see the need for adding another page of info
and just overwrote the totals page.