900 hrs with parking brake released will always be 900 hrs, no matter if CI0 or CI400+.
The unpaid part of the job is on the ground when the parking break is on, so no short cuts etc will have you working less days for the same reward. Get the 900 in the bank and for the rest of the time wonder why the others fly faster, shorter routes and leave the parking brake on when on stand for 20 mins due ATC.
J