Once we took the in-laws to see relatives in Utah. We spent two nights chaperoning them in Vegas (seemed like a week), dropped them in St. George and spent the weekend at Bryce and Zion, picked up the in-laws and put them on a plane back in Vegas, and had 3 or 4 more nights to ourselves.
Those were days of easy comps for us as long as we avoided long stays and weekends, so it worked out great.
Longest consecutive Vegas stay was six nights, once again all free, when the ECLVA and special friends were in town. We had to move once to get all the nights free, and ended the trip in a suite that a friend from ECLVA wasn't going to use. That trip I learned how it feels when you lose half your stake the first two nights. Fortunately, my luck improved.