We charge 3.3 hours (we're at $115 per hour), replace the pads, pack the wheel bearings (using new wheel seals), turn the rotors, lube the pins and perform a 27pt. inspection on the vehicle for every 4x4 (and some 2x4's) front brake job. But I think we change the price down to around $300 or so, not exact on that.
Some have decent luck just replacing the pads. If your rotors are perfectly flat, not tapered or grooved, your pins are nice and well lubed and your bearings are bathed in good grease (not the blackish/brownish crap found in most), then go for it.
If not, then pay someone who knows what they're doing, how to properly adjust the wheel bearing preload, will clean all the old crap grease out so as to not contaminate the new stuff and then install a good pad (not the half metal 'lifetime' crap found in Carquest and Autozone's nationwide).
But that's just me. I like stopping. Kind of a sticking point with me, I guess.
Not saying you need to spend a grand doing it, but a "$99 4 wheel friction reline" isn't all it's cracked up to be either.