The turbines will take at least an hour to cool or you'll melt every scope probe I know of. Then probably allocate 1/2 to 1 hour per motor. Open and close every piece of 25 year old cowling with no(ha) issues. 5 hours per insp would be fairly optimistic.
Pain in the butt that it may be,,I was refering more to the severity/seriousness that the short interval implies.