It takes less than four minutes, and it's not like published figures are remotely accurate. That shit changes depending on production lot, fuel pressure, how fucked up your charging and/or ground system is.
Have to do it means you have to do it, don't chump out on learning what the fuck is going on, and learning how to tune, just because some shit that doesn't mean what you think it does is printed out on a website somewhere. I'm retuning an R20 swapped 240Z right now because the asshole who tuned the previous motor thought 35 degrees timing was good for 15 psi, and this morning I dumped a tune off of a Lightning some other guy fucked up by hammering the base fuel table while leaving the MAF curve stock. This shit makes me livid - you DO NOT TOUCH SOMEONE ELSE'S CAR if you don't know exactly what you are doing.