That's some spirit you've got there
I'll help you a little. It seems the timeout is connected to the variable "arab_artef_zdrh". As for now it's value is
which means the timeout is 30 min on easy difficulty, 15 on medium and 5 on hard (actually it's 25 min more than those values but that's because the mission is coded in an odd way). Seems you just have to change the appropriate value corresponding to your difficulty and it should be fine. Unless you replace the original mission files you will have to play your modified mission in a mod. Ask away if there's anything you need to know.