I applied Wolfgang Fuzion to my Challenger late last November. By March it will still present and the water beading on the top half of the car was still pretty good. I don't care too much about water beading, but a lot of folks use it to gauge whether or not any sort of protection is still sticking around. I "maintained" the wax mostly with rinseless washes (ONR Wash and Shine, Wolfgang Uber, McKee's N-914, Meguiar's D114 and probably a few more). No spray waxes or quick detailers were used that I can recall, or if any were used it didn't impact much in a meaningful way.
My Challenger is used for a handful of short trips during the week days and longer trips on some weekends, but the majority of the time it sits in a garage. Wolfgang Fuzion is very nice and can last quite a while in the right sort of conditions.