9.3 extra hours
(besides quality training)
players (accounts) of top eleven must be between 10-15 M'
Let's say that the active ones - who make an extra training, are 100' K
X 9 hours = 900.000 wasted hours worldwide (elec.power and recharging mobile batteries not included)

That's because a dev didn't spend two hours to add a repeat button in individual training.
A T11 chapter in Chaos theory and butterfly effect
https://en.wikipedia.org/wiki/Butterfly_effect

facepalm
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* but I prefer Gert's
hey mate, give me the Lion