Hi Jordan:
I've been using Polymax RT almost exclusively for a few years.
In my case, I have been using the 32 oz. bottles (my usage is not high).
I don't vary my dilutions. I use the Kodak recommended 1 + 9 for everything.
It is cheap enough to use one shot, so that is what I do except for the rare occurrence when I am printing two days in a row, in which case if the evening batch has been just a few prints, I'll bottle it up and use it again in the morning.
It behaves much the same as Dektol/D-72. As I understand it, in other parts of the world it is actually labelled as "Liquid Dektol".
Like Dektol, if you leave it for a long time in a tray (like over-night) it tends to stain the tray.
The concentrate seems to last a long time. If you have a half full bottle it will eventually discolour, but seems to remain active even then.
I find the capacity information on Kodak's website conservative but otherwise accurate.
FWIW Glazer's in Seattle sells this in large quantities, so there must be commercial or institutional users.