Time to upgrade the buildings

[Pintaspt1]

I propose some kind of construction or evolution or even an item to reduce the evolution time of city buildings

[Dudeious.Maximus]

Merge @zephyr1 @Rook @littleKAF @DaveCozy

[Joroc]

It’s called gems

[Rook]

There have been a number of suggestions:

Shorten Build Times with 2 Builders Working on One Building

Could the wait times be shortened a bit?

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