Q: Is there no timer that shows when the era ends? I am always confused when the era suddenly ends. Do I have to use an egg timer or is there a clock somewhere that I missed?

A: The timer is the blue bar running in the top left corner. If you hover over it, it also shows the exact time until your era ends.

When the time is up, you have 1 additional minute to do stuff, but within this timeframe all giants will go to sleep, so don't expect them to do anything. If that minute is over, the era ends.
