Astouffer512 --
I don`t know Brian from Apex Detail..
Am not sure how 1 pad, microfiber or foam would ever be able to correct, polish, finish, an entire vehicle without losing a lot of it`s abilities to perform at the highest quality of work..
Sounds like your guy is using perhaps all microfiber pads ? Those are the only ones I know of that can benefit from air blowing into the fibers to help clean them somewhat..
But then of course, you have to wonder, where is all that dried compound, dead paint, etc., going, when you blast it out - unless - you do it in some confined area as your guy does..
I only use really nice foam pads that are made of a specific foam that does not absorb liquids quickly, and I will take a white short towel and wipe them off very well when done with the pass and look at what comes off on the towel, and then see and feel how the pad is doing.. I never use a brush because I never let the pad dry out completely, so you have all this dusty residue to deal with.. I hate that stuff and will not ever allow that to happen..
The only liquid I ever use in conjunction with the specific compound, polish, etc., whatever you want to call it, is a simple Pad Conditioner sold by Chemical Guys.. I apply the compound, etc., spread it around the pad, spray it perhaps once or twice, wipe it with my finger so it is all evenly dispersed around the pad and turn on the Makita and do the work..
For my needs and business plan, I always use several pads, sometimes 6+ to correct the paintwork perfectly, and as I use them I can tell when they are starting to absorb and hold too much liquid and the foam is retaining too much compound and dead paint, etc., and then I replace with a new or clean, dry pad...
If your guy is using any of the random orbital machines out there, which put a lot more stress on the pad because of all the movement, compared to a Rotary, I am amazed that just 1 pad can last through an entire correction/polish process and not be all torn up at the end.. It is always too much heat that always kills pads and paintwork if not carefully managed..
And as has been already stated by Accumulator, there is no set in stone number for how long any pad lasts.. It always depends on how it is used, what product/s are used with it, and how it is treated through the process, cleaned completely or not, and then thoroughly dried before it is used again..
I have had some Hydro-Shreds wear down pretty thin, before I throw them away.. But it has taken probably around 70+ vehicle corrections on my Rotary to get them worn down..
Dan F