In the Robbo's we use datcon meters (like your Hobbs meter I presume). Its in decimal hours.
In an R22 it ticks over when the engine is running (whether sat on the ground or flying).
In an R44 it only ticks over when you pull power on the collective (flying costs money, but sitting on the ground engine running and auto's are free!).
Wonder if you could get somewhere for half price in the R44 by constantly climbing and then autorotating between two levels..
