The timer seems to constantly reset a 2nd time after spawning an event. Like here it spawned Chinook and then 20 mins later it reset the timer again after the CargoShip spawned.
(10:25:08) | [Automated Events] Spawning Chinook
(10:25:08) | [Automated Events] Next Chinook event will be ran after 01:16:03
(10:43:55) | [Automated Events] Spawning Cargo Ship
(10:43:55) | [Automated Events] Next CargoShip event will be ran after 01:35:44
(10:46:07) | [Automated Events] Next Chinook event will be ran after 01:40:39