Ok I haven't done the work but you have the following involved.
Honestly, a supper fast guy might be completed in 4 hrs, but you have a complete brake job, flushing of the system, and bleading it alone will more then likley take about an hr, Fronts I think could be done quickly maybe 1hr, rears may take 45min a side, adjuestment of the parking brake too. flushing . . lets not forget you have 6 tires to deal with too. Im not saying 5 is the number but after thinking about it and the fact you are providing your own parts AKA no markup for them I think its pretty fair. But again an experianced dude may only take 2 hrs without tourquing anything and flying through it. I say call around to compare.
Front
Raise and support the vehicle.
2. Remove the wheel and tire assembly.
NOTE: Do not allow brake hose to support caliper adapter assembly.
3. Remove the caliper from the steering knuckle, (Refer to 5 - BRAKES/HYDRAULIC/MECHANICAL/DISC BRAKE
CALIPERS - REMOVAL) and remove caliper adapter assembly.
4. Remove the extension to the rotor nuts HD DRW ONLY.
5. Remove the rotor from the hub/bearing wheel studs.
Rear is a little more involved because you have to pull the axle shafts out to get the rottor off.
REAR DUAL WHEELS
1. Raise and support the vehicle
2. Remove the tire and wheel assembly.
3. Remove the disc brake caliper, (Refer to 5 -
BRAKES/HYDRAULIC/MECHANICAL/DISC
BRAKE CALIPERS - REMOVAL).
4. Remove the caliper adapter bolts.
5. Remove the rear axle shaft from the housing on
dual rear wheels.