I think this is incorrect... there is a 6 hour save game update, so if you log out of LS and re-open it again within those 6 hours, you just return to your game... you are better off create game, and then leave the game to clear the catacomb maze completely.
Wrong. I just took a few steps in a cata, left to town, clicked log out. Then came back in as same char and (after the flood control) i was in a new map.