Is scheduled process model running in backend in Maintenance Window?

Wdym by Maintenance Window?

This depends on what kind of maintenance window you're using:

• If you're talking about the maintenance window on cloud sites, during that window the site will typically restart, so scheduled processes would not run during that time. However, once the site is up, any processes that were scheduled during that time will run after the restart.
• If your'e talking about the maintenance window in the admin console, that doesn't bring the site down, so any scheduled processes will still run.