hmm like 100 world quests should take lets say 3-5 minutes pr quest, lets say roughly 5-7 hours to max an artifact, ofc this is with 25 artifact knowledge at roughly 1.25^n
as for how long it will take on live, roughly 3 months real time.
I was at 27 traits, yesterday (29 now due to an exploit) and was expecting to be done in roughly a month, which would be 3 months after beta release, with a few set backs, and a few boosts to compensate. Ofc someone playing less or starting a bit later should expect 2-4 traits less, which means it would take roughly 10-20 days extra.
TL;DR 3 months to max artifact