I last won the jackpot about 3 weeks ago. It seems to land on it every 6--8 weeks. I've never had the jackpot from the daily treat machine though in over a year of having it in my game.
I landed on the jackpot Saturday just gone @spottedhorse. I used to land on the jackpot every three to four weeks, but since King has changed the Wheel to spin faster this is the first time I have landed on it in over two months.