I could've used Lampenpam's method but shorter
OnTrigger - game_text - AddOutput - message 1 minute remaining - no delay.
OnTrigger - game_text - AddOutput - message 45 seconds remaining - 15s delay.
OnTrigger - game_text - AddOutput - message 30 seconds remaining - 30s delay.
OnTrigger - game_text - AddOutput - message 15 seconds remaining -45s delay.
...and from this point, it starts actually counting...
OnTrigger - game_text - AddOutput - message 5 seconds remaining - 55s delay.
OnTrigger - game_text - AddOutput - message 4 seconds remaining - 56s delay.
OnTrigger - game_text - AddOutput - message 3 seconds remaining - 57s delay.
OnTrigger - game_text - AddOutput - message 2 seconds remaining - 58s delay.
OnTrigger - game_text - AddOutput - message 1 second remaining - 59s delay.
OnTrigger - game_text - AddOutput - message [end message] - 60s delay.
I should leave all of everyone's comments because it might help people looking for things like this. They might want it, they might not, but who knows?