Does the duet have a heater inactive timer ?
Does the duet software have a inactive timer for the heaters ?
I have set the filament run out to trigger a pause to the print , but keep both the bed and filament heaters on .
After a set time will both heater switch off / fault or just stay on forever ?
If it's a regular pause then the heaters will stay on forever. If you want a timeout, you could implement that in the daemon.g file.