I once heard from a Rosh Yeshiva that no where in the Torah does it say that you have to wear them everyday. Al pi Torah, a person is soppose to where tiffilin everyday all day, which we don’t do today for a number of valid reasons. Of course, whenever he wears it he gets the mitzva, so by wearing them the next day longer, he gets the mitzva longer.
I also once heard from R’ Amnon Yitzchok (I think) that if someone missed many years of Teffilin (baal teshuva) one thing that he can do, is to get others to do the mitzva. So that on a single day he can have the zchus of putting on teffilin more than once.