Timers for construction and arts is unstable and often inaccurate
I am seeing that when I go to ungrade a building, the stated upgrade time is most often not what shows when I start the upgrade, even when I am not activating building speeds or requesting support. 1 we 1 day can become 5.5 days. Very hard then to plan for completion during the brawls! Also the timer will vary by the hour, going up or down. When I toggle the speed it seems to go down, not up!
Other members have reported the same bug.