The event of RELOAD will wait if the requested entity is in service.
TPX has scheduled the event. Once the other tasks are completed, this event will trigger.
In most cases where traffic is not heavy, the RELOAD of 'panels' can be immediate, however, when a Reload is requested on a busy system it can take a few minutes for the reload to take effect.
This is because the effected panels may still be 'open' during the reload. TPX waits for the 'no-use' flag before updating to avoid any corruption.