Book calls for about 5 1/2 hours for timing belt on the VG in a truck. I do it in about 3, due to experience and having the tools. Easy way to break the crankshaft pulley bolt loose, is to use a 1/2" breaker bar on the bolt and wedged onto the floor or the frame. Unplug the distributor or pull the EFI fuse and bump the starter. You will need a pulled to get the harmonic balancer off. It will need to be a 2 bolt style with a pair of very long M6 x 1.0 bolts, about 80mm long. A steering wheel puller works well. Removing the radiator and putting a piece of cardboard in its place to protect the AC condenser gives you more room to do the work.
While in there, I recommend getting a timing belt kit, water pump, thermostat, front main oil seal, both cam seals, and a new woodruff key for the crankshaft sprocket. Plus replacing the coolant hoses. The parts really don't cost much, most of the cost in the timing belt replacement is time. If you don't replace those parts while in there, you will be back in a few months when what you don't replace fails.