The main problem is that the Sleep Timer defaults to 15 minutes.
Go into Settings → Game → Sleep timer and left-click until NEVER is selected.
This is a per-device setting.
My experience with Nintendo Switch this 15 minutes will crash out of the whole of UEFN to Fortnite Creative due to Nintendo having its own suspend system
Setting sleep time to never no longer crashes and at worst drops back to the lobby with a network timeout reset message
I already have that enabled the question i was asking is with the recent update to session times increasing to 19hours i believe did this also include uefn session as mine seems to be still at 4 hour server time per session