Ah yes, the instant regulation. Sounds wonderful in advertising.
Adjusting the rate of a watch has always been a remarkably easy process. I can do it in under a minute and that includes getting the caseback off and on, give me 75 seconds if the regulator is adjusted with screws.
But........
The hard part is getting the watch to be accurate to net zero, and that takes at least a day, more properly a few days, and probably a repeat visit for fine tuning. The rate of a watch is inherently inconsistent - it's affected by temperature, position, movement, amount of power reserve, use of the chronograph, etc, etc, etc, etc. The aim of regulation is to get all of these errors to net to zero, or as close to it as possible.
If a watchmaker whips off the caseback, retards the regulator a fraction because you report that it's running slightly fast and then puts the caseback on he or she is ignoring all of these variables. What should happen is observation over time in different positions, at different amounts of power reserve, and ideally at different temperatures to see what the error has been adjusted to, and only after that has been concluded satisfactorily should the watch be returned to the owner. Of course it never happens that way because you can't make money that way, and because it sounds so much better to promote quick adjustment
I'm guessing that BUSA currently isn't allowing their AD watchmakers to regulate them because they are new movements and they want to do that at BUSA, but that will mean a better regulation.
If 5 seconds on a new watch is that big a deal to you then if it rests on it's back overnight then lay it on its side crown up instead, that will likely reduce it.
In terms of the chrono, I would recommend running it for 24 hours a month to ensure that the oils don't migrate away from where they are needed.