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When receiving a reward at the very end of a turn, sometimes there isn't enough extra time (10 seconds?), and it disappears.
When entering numbers for the timer, the numpad (it seems this has already been mentioned) and the insert key don't work.
Also, I think allowing the timer to go into negative values would make the game more flexible and convenient. Of course, not for 2 days in a row; on the next day, everything would be compensated, so the total duration of the turn wouldn't increase.