20 minutes?
I can swap my jets in about 10 minutes now, really!
Allen wrench and jets, badda bing, done.
The first time you do them it does take a lot longer, twice as long as you think it will. After that, you get the feel of it and can do it blindfolded if you do enough of them.
Really, 15 minutes if the ss allen heads are on the carbs, Airbox or not.
A HUGE time saver, remove the rear shocks so you can get to the rear airbox screws. If the bike is on the lift and you drop the rear wheel down (remove pipes too so you don't bang them up) and zoom...airbox slid back.
But "Why?" you ask. You need to,(ok, should)completely remove the carbs one time to swap the screws out to the allens, after that, just drop the bowls to swap jets. That is the whole reason behind the allens.