"(Beraisa - R. Shimon ben Gamliel): The extra Ketores every year would accumulate - every 60 or 70 years [about 184 Manos would be leftover,] they would make just half a batch.
(Rosh (in Shitah) rejects this text, for the excess in 60 years cannot suffice (an average year is really 365 and a quarter days, the average annual excess is two and three quarter Manos less the double handful.) Some say that it is possible, if the last two years were not leap years. Many prefer the text "every 72 years"; calculations of the double handful range from a fifth of a Maneh to a half-Maneh."
Why wait so long to recycle? The gemaras discusses how it might spoil? No aniyus b makom ashiras?
What lesson in drushes? practical?
hg, ny usa
The Aruch La'Ner (6b, DH "Hayu") says that it must be that it is a Halachah l'Moshe mi'Sinai that one may only "recycle" if it will add up to half a year's worth of Ketores.
All the best,