Absolutely! If you’ve got Squadron Dungeons unlocked you can find a scenario to run those for you over in the grid/scenario subforum.
You can set it up to run a dungeon on a loop, only stopping to repair and turn in drops for more seals to fund more dungeon runs.
The only issue is that the only dungeon that we currently have access to that gives as many seals as it costs is level 54 so when leveling classes below that level you’ll need to have a good amount of seals already or go farm up a bunch before you run the scenario overnight.