Not very long for that one. Jack up the front, jack stands on the frame, remove tires and disconnect the: sways bar links, shocks and track bar from the axle only. Lower axle, pull the springs out, pull out the rubber spring isolator. The put the spacer on, spring isolator back on, springs back in and bolt everything back up.
No spring compressor needed and the process is the same front and back. Make sure you have a ratchet strap to pull the axle back over to bolt up the track bar.
So a set of sockets, wrenches, 2 jackstands, 1 floor jack and a ratchet strap.