The AN124 - when I flew on it in the mid 90s the engines were spooled up to 80% and had to remain there for 4 minutes to heat soak the engines, before full power could be applied.
Long time ago, watched one at SNN preparing to go west a long way, did exactly as above, then was cleared for take off, with a request, "call passing through 1500 Ft".
Off it lumbered, eventually, in a large cloud of spray from a very wet runway, and fairly quickly vanished into the murk. Well, I listened to the decreasing engine noise, then after a while thought, "oops, he's forgotten the 1500 Ft call". Wrong.
After close on 7 MINUTES, he called passing 1500 Ft. I don't know what weight he had there, but it had to be real Heavy!!!
(edited to correct typo's)