You were getting 36 hours (3 hours a week for 12 weeks) of playability out of a full bed of RPM Blast in a Pure Aero?
it's not impossible.
I used to play with RPM Blast, but I switched to the RPM Blast Rough, and to my memory the Rough breaks faster.
Long story made short.
I have the feeling that previous version of Pure Aero, previous to 2018, was OK, while 2018 version is a "string eating machine"
With the PA 2018 I can break the strings in just 1-2 hours, on one extreme, playing with 1.25 - 1.3, indoor clay, lots of humidity, ball machine, pressureles balls.
But at the same time, outdoor clay + indoor carpet, 1.35 Rough, healthy mix of ball machine + humans, and they stringbed last long.
The less the ball machine is used, the more it lasts.
OK, you could raise the valid question of playability.
As long as I keep playing with same racket, I adapt to it, so most of the time I don't have to cut the strings, they will break.
But yeah, as I recently switched mid of the training from an "old" stringbed 1.35 -> fresh 1.3, it took me 20 minutes to adjust.
And going back to the 1,35 that I didn't cut probably was one of the reasons I lost badly my last match
In summary, it depends on:
PA version
string gauge
players skill, in particular how hard do you hit the ball. I am breaking the strings the fastest when I train proper hitting, not average rally
player demand. Some players would cut the stringbed I still have now (1.35), others won't notice much difference