Honestly if you just focus the main quest you can finish the Endwalker MSQ in a Weekend, of course it depends a bit on luck with the que time for trials and dungeons and on the groups for trials. To be honest i think the trials should be placed outside the msq, because if you dont get a good group it can be like a stupid content blocker and take hours to finish. For my taste they take to long and are to hard for normal MSQ content and should be placed in savage mode.