The longest I've flown that rocket with a 160 ton payload intact was 00:01:50 MET. I want to see someone beat that. Edit: I got to 2 minutes 20 seconds! The rocket disintegrated 4 seconds after first stage separation. Edit2: It seems that the structural failures are the result of how the payload is strutted to the launcher, as every failure started from the connection between the payload and the LV (the SAS modules). I'll have to reposition those. Edit3: Finally used all of its fuel. It didn't make it to orbit.