Sometimes I quickly press "re-train" and put my phone down to continue whatever I was doing only to discover it only has a few days left for my training to finish. IT IS GETTING REALLY FRUSTRATING...
Maybe I should've let it go to the end. Maybe he was a special bonus troop with 50,000hp, 3850dps, a range of 7 and had the ability to smite buildings with a single stroke!!!
I have seen some odd training times too... in fact the same has happened to gathering from trees and from some building upgrades. Luckily, they never actually take this long...