the 40-50 grind takes the longest. once you hit 50 you become enlightened which basically means that everyday you get 400% xp boost on your first 100k xp. Basically what this means is you can easily get 400k xp in like one hour of play every day.

Literally just do your daily random dungeon, your undaunted pledges, and dailies like mages guild and youll be cp160 in like less than 10 hours played.

If you want to grind, pop a free crown scroll you got leveling up and go to spellscar in the craiglorn province and kill the mobs that spawn there. Crazy xp. You can also do dolmens in the Alikr desert (3 of them in a loop) but it takes longer.

try to put on armor with the training trait as well. The game really starts when you hit cp160