If you just want to go for Conqueror, definitely go for Boss Mode and the rank 65 gems. Those conquests are BY FAR the easiest and least time-consuming in S10. Going for Guardian and doing any other 3rd conquest will definitely take a bit more time this season (unless you're super experienced with Sprinter and can one-shot this one; but for anyone who has never done this, Sprinter can take up to an entire day if you make mistakes and/or get unlucky). Of course doing the set dungeons or 6x GR55 is simply time consuming due to the fact that you need 8 or at least 6 sets, respectively. It's not about leveling the second class (that takes 10 minutes of powerleveling) but getting all the gear, changing build, doing the dungeon/GR and so on.
As for the tracker update, I definitely intend to update the tracker - but I don't have ANY data for the conquests past chapter 4. Not sure if I have time to do the season journey on PTR, so if anyone has screenshots of all those up to Guardian that would be great. I'll prepare the new version then (it'll go live once S9 is over).
Do Boss Mode and the rank 65 gems & Boss mode on HC for the 3rd conquest!