I completed pretty much all the post 50 main scenario over the course of three or four days of solid play, so you've got plenty of time.

One of your main endgame priorities should be doing all the dungeons once each to unlock high level roulette. You'll get a ton of soldiery tomes while you do so, more than enough to buy a full set of 100 ilvl accessories from the vendors in Mor Dhona. Endgame gear will primarily come from soldiery and poetics gear, and drops from various raids and EX primals.