-a core with no upgrades seems to last 40minutes even in combat
-sprinting drains them faster
-it looks like you take no damage with armor on the armor takes the damage(not for sure on this one)
-you can use any weapon and bring up your pip boy in the armor
-you can power bash in armor
-with fully upgraded core perk you get~ 80 minutes or so
-this was based off t-60 and t-45 Idk if different armor work a little different
So power armor dosnt seem like it will be a real pain to use,from what I've seen it looks like you can still do power armor playthroughs