Yeah, I did kill one by one. Try it yourself, I am not joking. Made the experience more epic
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Total played is 4 days 22 hours, to be more specific. But this is meaningless, as I had to do warrior quests and the WW quest which took me forever to kill the trolls in SFV, didn't focus much on leveling, till from 40 to 48 in 30 hours playing solo and dungeons.