1)
How long did "Gafris va'Melach Sereifah Chol Artzah" last?
1.
Yoma, 54a: We learn via a Gezeirah Shavah "Al asher Azvu es B'ris Hashem" "Vehigbir B'ris la'Rabim Shavu'a Echad" - from Daniel, 9:27 - that it lasted for seven years. 1
1
See Torah Temimah, note 20.