This equals 427.6 hours or 17.81 days. Adding all fifteen films tacks on another 22.1 hours, extending total viewing time to 449.7 hours, or 18.73 days.
That is, if watched it without ever sleep/break. If viewers were to spend the eight hours a day that would usually be for work or school consuming the anime instead, it would take 53.45 days to catch up with all episodes. With movies, the total to catch up would be 56.21. Assuming they did this everyday for 8hours, including weekend. Almost two months worth.