Keep flying the aeroplane, call gear up, make sure your mate selects it up - say 5 seconds max. Don't wait for it to actually come up, because if it won't there's ****** all you can do about it at this early stage.
Both pilots identify, another 5 seconds if you are really slow.
Tell your co-pilot to get on with the recall actions for engine fire, maybe 15 seconds to do the lot, so that's 25 seconds in all.
What often makes it hard, and I have so often experienced it in the simulator, both as instructor and 'victim', is that various operators set up their own cumbersome requirements to have the poor ****** trying to fly the thing get a bit too involved in the actual drill, instead of properly training all co-pilots to do the drill in a methodical manner, with the pilot flying just monitoring.
Seems a bit less emphasis on word perfect 'fly-by-mouth' and more on really knowing just a couple of vital drills really well is maybe what's called for. As I said before - if you know what to do, just DO it - if in doubt get the book out. A fire is one you have to know.