It doesn't take that long, a fraction of the time it took to get Stasis maxed out. Here's a tip if you don't really want to play the others much: Don't buy all the fragments on your main or at least second character. If you leave at least one you will still gain the green currency stuff on that character (which is in your shared inventory) so you can build a big stash of it then when you complete the story on an alt you can just buy everything straight away.