is there a way to have the chinooks despawn after so long or is this it "Time Before Vehicle Wipe (Seconds)": 0.0,

Yes to both, modify the "Interval to check vehicle for wipe (Seconds)" config setting to change how often you want the plugin to check if its been enough time to wipe the vehicle.

Code it does on Startup (if interval is larger than 0 and if you have any time before vehicle wipe settings enabled on any of the vehicles): timer.Every(configData.global.checkVehiclesInterval, CheckVehicles);

thank you