No more than 60 minutes, start to finish, to get it 90% there using a Mint, Wally, or UNI-Pro, followed by a Foz. The UNI-Pro is faster than the arc protractors but I only like it with some arms. The next 7% or so is refined over a day or two by ear. The remaining 3% lurks in the void of perpetual uncertainty. Hey, I'm an audiophile.
The typical bugaboo in the first 90% is whether the cartridge screws creep an iota as they fully tighten, shifting alignment. If the do, after the profanities, I start again.