As for the 8 minutes thing, I read it around various wikis so it may just be fake I suppose. But it makes sense considering how dangerous the BETA are.
As for the height of them, I did find a picture showing the sizes of all creatures and aliens from the Integral Works. My estimate on the TSF are maybe...10-14 meters. I'll get the picture and post it.
You see, I've been aware of the series (barely) for some time now. All started when VOLKS started making figures of the Tactical Surface Fighters. Too expensive for my tastes, but my interest in the series remained steady.
The other day, Kaiyodo showed off a prototype figure of the Type-00R for the Revoltech line. Those ARE NOT expensive.
I must know more of these mechs, and the BETA as well. I only know so much, TVTropes helped out a bit though.
I know the Senjutsukis are:
Modeled and named after existing aircraft
Use standard shell firing weapons
Pilots have an 8 minute lifespan
You wouldn't happen to know like...technical info though, would ya? Such as the height and weight of the mechs?