When I was pumping gas for a living back in the late 1960's, I repacked my share of front wheel bearings for customers, and yeah, it shouldn't take more than a couple of hours max I would think.
The rear, I don't know.? I never did rear wheel bearing repacks.? In those days everything was rear wheel drive and if I recall correctly (been a LONG time) the rear wheels got plenty of lubrication from the differential oil.
So, on the (rear wheel drive) toyhouse, do the rear wheel bearings need to be separately repacked?? How much more is involved in doing those than the front?