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1. One election (normally once 4 years) or one change of prime minister per post, though only a few Japanese prime ministers manage to serve more than 2 years in OTL.
2. Don't skip into the future, go in order.
3. Yes, I know, it's Japanese prime ministers, but a year of 4 or more prime ministers* is only allowed once in each TL
(*For example, in 1945 [OTL], Koiso resigns in April, Suzuki resigns in August, Prince Naruhiko resigns in October, then Shidehara becomes Prime Minister. [OTL] 1898 was also a year of 4 prime ministers.) Okubo not assassinated 1885: Toshimichi Okubo (Independent / Satsuma Domain)
Hata dissolves the parliament after no-confidence motion 1994: Tsutomu Hata (Japan Renewal Party)