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I recently read on Matzav.com an article by Rabbi Dovid Heber discussing the 247 year cycle in the calendar. He mentioned that every 247 years the Hebrew calendar is exactly identical. Now in the article he mentions that every 247 years the Molad is almost identical. It is only a mere 905 chalakim (50 minutes and 16.67 seconds) earlier.
My question is at what point along the 247 year cycles, due to the constant slow change and creeping up in the Molad will the calendar be forced to change?
According to the Pri Chodosh, in his notes on the calendar (in the back of the Shulchan Aruch on Orach Chaim siman 428), the next time there's a difference from 247 years earlier will be in תתמז-תתמח (in machzor שח), which is 2087-2088 on the secular calendar. The last time was in תשז-תשח, which is 1947-1948.
