Cleared for take-off Nigel announces he'd like a "minute or two".
The early P&W (-3a) engines on the 747 required a 30 second power run when fully lined up in icing conditions. Many years ago at Chicago I explained that to the ATC lady before we got to the runway but was told to taxi to the far side of the airfield to use a different runway. No complaints, it's their airfield, but better than having iced up engines on a 747-100 at max weight.