Time Investment Estimate
None of us can answer that since we have no idea where in the jungle the 40 plus Hero Challenges may be lurking, or how long it will take to get the travel masteries needed. Heck, we might need some Hylek and Exalted masteries to be allowed in some places — won’t there be some Exalted signs we can only see once we invest in the mastery and those let us through some barriers? Could be HP on the other side.
We don’t know how easy the first 20 HoT HP will be, either, though you only need 20 if you have 200 base game HP already.
Otoh it’s entirely possible that 200 points will cover you up to GM traits and the rest will go to runes and skins, at which point you certainly can play as the elite even without a full unlock. I’m sure hoping that Daredevil can at least get to the first GM dodge, since the lotus daggers are my preference anyway.
No, no one knows. However if you have the currently available Hero points done you’ll have the initial unlock and a fair amount completed. The last section of the unlock appears to be for the cosmetics items and runes, so not all that 400 is needed to unlock the gameplay part of the elite.
ANet may give it to you.
Although it’s 400 hero points, the new hero challenges are worth 10 points each, so it’s only 40 challenges (or only 20 if you already have map completion from the core game ). Potentially, that’s only a couple of hours. The big unknown is how accessible the new hero challenges are, and how many will require masteries to be completed before they can be reached.