There are no water or chemicals to deal with, so there's no drying process. That's important if you have a time constraint. You can go in when a factory is shut down for a period of time and have plenty of time to coat the floor. Cleaning up the few stray abrasive shot after the blasting process usually is simple. A regular broom can be used, but heavy sweeping often isn't needed except along the edges of the floor and in corners.
Some contractors use leaf blowers for the final cleanup step.
Purchasing a shot blasting machine is pricey to say the least, but there's a payback in labor savings. Determining that payback varies by the size of the machine and how it's used. It's possible that you could pay for one on one large job. As a rule of thumb, Rick Drake said that if you can use the machine 20 percent of the time, it's paying for itself. A lot of contractors can't afford shot blasting equipment and they usually acid-etch floors.