I'm about to start Day 8 with "5 days left until the end". As far as I can tell, I've completed all the main quests everywhere as well as almost all of the side and Canvas quests. Just got a couple more to do as far as I can tell. I've killed about half of the last ones (haven't found the way that makes them appear earlier that the game hints at yet but I plan to be on look out for it as I finish the few other side quests I haven't done before looking it up - that said, it hasn't been difficult making the last ones appear by just killing all the enemies I see as I go from place to place and use the stop-time ability). In the upgrading of abilities section, there are some components I haven't found at all despite how far I am and I haven't even seen the ability to upgrade weapons/shields yet (again the game hinted it was possible but it hasn't come up yet).
Have I screwed myself by doing the majority of the quests and a lot of the Last Ones by now? And am I going to still have to play the game multiple times (no big spoilers please) as a lot of people tell me I have to? - at this rate I don't see why I can't complete all of this in the remaining days. Also, if I am as far as I think I am and finish it all in the next day or two, what do you suggest I do for the remaining time (especially if all the enemies are extinct - as they already are for me in half of the Wildlands)?