OK, yeah, we may have to enforce a hard limit on how much immunity time you can get next time we do this. Five or six days at most seems fair to me in this regard. Alternatively, if you get an extension, you cannot win any more immunities even if they're offered for a time (so if you extend your 3-day to a 5-day, you're officially unable to extend it further and have to wait until it expires to get more).

I figured that Catie's success in this department was reasoning behind why we're not seeing Immunities.