I have recently heard that since the gematria of Va'etchanan is 515, Moshe davened 515 times to enter Eretz Yisrael before Hashem told him he couldn't daven anymore. The reason is that if he would have davened 1 more time, Hashem would have had to let Moshe enter Eretz Yisrael on the 516th time.
Some people say that the reason why Hashem would have had to let Moshe in on the 516th time is that there are 516 hours between the beginning of Rosh Hashanah until the end of Hoshanah Rabbah, so Moshe davened every hour to be let into Eretz Yisrael.
I thought that this made sense, however after doing some math, I realized that Hoshanah Rabbah is the 21st day of Tishrei, and there are only 504 hours in 21 days. So where do they get the extra 12 hours from?
I am asking 2 questions:
- I am not sure of the source for this statement so I wanted to know if anyone knows the source since that might help me solve my problem?
- Where do the Rabbanan get the extra 12 hours from?