There are many ways of charging.
I know of time charged chock to chock, i.e. time moving.
We get charged by the HOBBS meter, roughly engine running time.
And I've heard of take off to landing plus 10 minutes taxy time (for busy fields where you might have to queue and hold unfairly).
But engine start to finish PLUS 10 minutes sounds illogical and unreasonable.
Of course any instruction, briefing, de-briefing would be reasonable to charge extra.
Last edited by JSAG; 4th Jan 2017 at 11:02.