Once you have invited someone to the bridge of your ship, how "sticky" is their presence there if you don't kick them out? Do they stay if you return to the tactical view and move the ship? I do know that they'll remain at least a brief time if you log out, since I got kicked once and relogged to find guests still present.
This is certainly something I can experiment with if need be, but I figured I'd ask first.
They will be gone when you leave the sector. However, from their point of view, they are still on your ship when they don't leave. Technically, they could stay as long as they like to, there is no timeout (only the usual 1-hour-inactivity-logout).