Seated appendix carry is good for about 2 hours in a car for me. Anything more than that and I take it off while in the car.I use appendix carry a lot off duty (especially in the summer) but I don't use it on duty.
On duty I carry 2 spare mags and a set of handcuffs, and I spend the majority of the work day sitting on an airplane. Recently did a 17hr flight......for me appendix carry ain't something I wanna do for that length of time while seated.

