The air conditioner stops in the middle of operation (ON timer in operation)
When the ON timer is set, the air conditioner may start as early as one hour before the set time in order to bring the room temperature close to the temperature set with the remote controller.

How to set an air condition timer for your home
The most basic method is to use the air conditioner's remote control's aircon timer function.
This is only possible if your air conditioner was built from the ground up with this feature in mind.
An air conditioner timer can only be used to set the entire duration of your air conditioner's operation.
You can set the timer for 1 hour, 2 hours, or as long you want your air conditioner to operate when it is switched on.