Actually that's been set to 48 hours for the longest time. At least 3 months.
goo . gl/g4mtHw says otherwise. As you can see, your popup clearly states 8 hours. There is no mention anywhere of 48 hours.
I missed this. Now that it is mentioned, if we can just complete one ticket ( thus 1 captcha) every 23 hours, then we could never complete such weird condition to: "Complete 1 Ticket Captcha every 8 hours"
Therefore, we would lose levels. So far I have not lost any levels other than a few days go, 30+ levels, for unknown reason (it happened when the faucet rewards were changed).