Since Timers usually invoke actions that take a while to run and are processor intensive, the OutSystems Scheduler Service only runs a fixed number of timers at the same time. By default only three timers can run at the same time, but this number can be customized in the OutSystems Configuration Tool.
When multiple timers are scheduled for the same time, the OutSystems Platform uses their Priority property, to choose which ones should run first.
To learn more about the timers architecture, and how the OutSystems Platform ensures their scalability check the Timers and Asynchronous Processes Technical Note.
Use Timers | Timers Properties