Power leveling in ESO is very common among the endgame players. Very experienced players often level up to 50 within a few hours only. Of course you need to know all the tricks of how to grind efficiently, you can learn more about that in the ESO Power Leveling Guide. Don’t expect to be that fast with your first character, because you will mostly be busy learning all the mechanics of the game and thus won’t be able to power level instantly. However, your 2nd or 3rd character leveing process can already be way faster.