Bringing my 97 Maxima up to college and want to make sure its ready for the snow and the fact that I won't have a driveway to wash it every couple of days. I already did the Meguiars deep crystal 3 step process and was wondering how long the wax usually lasts cause I probably won't be able to wax it again till Thanksgiving or possibly even Christmas time. :scared Should I use a longer lasting wax on top of the Meguiars wax to make sure its protected?