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Is it significantly better with a 4+1 timer? Very doubtful. All topics with kilometer-long chains and excessive re-divisions into 100 cities with such a timer don't work. As a result, it will be a more straightforward game with faster interaction.
For Blitz-Jeb, the typical game duration is 2-2.5 weeks. For Blitz-Mirror, I think it will be about 4 weeks.