i answerd wrong, gonna retry.
You need to learn how to use Local Storage.
https://www.scirra.com/tutorials/1461/h ... age-plugin
Once you got that it is easy.
Timer has an expression: CurrentTime(tag)
The time in seconds since On timer last triggered, for a timer with a specific tag.
Write that in the Local Storage.
When relaoding the game, start the timer with the same tag for the remaining time in the layer startup.