After syncing it shouldn’t take much time at all unless they were closed or something. Have you tried to connect from a mobile wallet just to make sure your LN is reachable?
Discussion
I've never been able to connect to it with Zeus. I tried again recently with no luck (over tor).
I managed to connect with Zap a while back but I eventually uninstalled it when it became depreciated.
I've just restarted Umbrel. Fingers crossed it comes back online quickly.