The countdown for my energy says that I'll get 10 energy in 20 hours time. Do I have to wait the full 20 hours to get any energy at all or will it give me +1 every now and then?

Even so, 20 hours seems a long time for 10 energy, especially when a thread further down mentions getting energy every 10-30 minutes?

Is this right? What's going on with my game if it isn't?