I'll see what I can do highhead.
I have other missions that last much longer...as long as 24-36 hours without OOM crash.
This mission consistently is dropping between the 60-80 min mark.
Leads me to believe that it could be a CUP Terrains or CUP Units issue as the mission uses CUP and 3CB (use 3CB in several other mission without issue)
Just spitballing here but I'll see if I can reproduce in vanilla mission.