There's no real need to spend a days of time alone. The first dungeon is at 81, and you can get to 81 from running levelling and alliance with your friends. Skipping through the cutscenes you'd only need to spend around a couple minutes running from A to B at max. You wont be able to access all the content at once since progression is part of the RPG design mentality, but it's genuinely super speedy to jump through if you skip cutscenes.
