1600 hours won't help u get the crux. You can only do the raid once a week, so if you have 3 character that's 3 times a week. If you're on a good team you should be able to beat Crota within 15-20 minutes, per character, which is the only allotted time that matters when it comes to the crux. So really, if you spent an hour on Crota (dealing with all the glitches) with 3 characters, then you would only be spending 3 hours a week, trying to get the crux. All those other hundreds and hundreds of hours don't mean shit when it comes to the crux.