My bf and I can't do more than 1 NM train per day, 2 if we are really bored. Still now we both are 17, almost all Anemos set (just 1st set, we have life), and just need to get to 19 to get feathers. I luckily also got all the interesting things from lockboxes, including the T-Rex. Not bothering with ugly XI gear. I guess 1 or 2 days and we will have our first job done.