In SHIII there are recovery of systems applied over minutes without cheats.
I think the cheating Ssnake spoke of, was what the mainenance guys ususally do a weapons display shows.
IOT replace the Leo2 engine withing 10-15 mikes, they have opened all valves, clutches and stuff before the roll the tank in.
This way tank in engine out=3 mike, when under rel conditions they'd need the most part of an hour to prepare the engine befor pulling it.
Getting the new engine in and the tank rolling, is indeed a job off ten-mike or less.
(I'm speaking of the Leopard2 here)