Someone I know well finished the story in precisely 37 hours and 50 minutes of no skipping of anything. I saw them online throughout this time (and a while afterwards too), they said they didn't go to bed at all. Probably took days off. They still keep playing for long hours to level everything to 90 and keep their Mentor status.

Meanwhile I'm at the halfway point despite playing since launch (was still doing ShB during early access). I play with my partner in leveling dungeons for a bit so that breaks the flow often.