There needs to be some indication of how long, specifically, an upgrade will take (just as there is a clock indicating when a next attack will occur or how long a movement takes) before the upgrade is chosen in order to make an informed decision.

If enemy units are approaching and will arrive in one hour, it doesn't make sense to start a 1.5 hour upgrade, but it does make sense to start a 50 minute upgrade, for example.

Thank you. I see it in the status bar, so I've deleted that part of my comment (I do not see it when hovering, however).

The rest of my suggestion still remains - I would like to see an indication of how long an upgrade *will take* before deciding on the upgrade.

Thanks.

Thanks! There it is.