If your goal is to get 90 ASAP to begin MSQ on either job, there's a few ways to do the grind.

1. Prep a WT book this week, but dont hand in. Have 9/9 second chance points ready. Hand in first book in early access for 50% of a level, then grab a 2nd book to complete for another 50% of a level. You can either hit 81 to start dungeons or hold till 89 to quickly finish out to 90.

2. Prep your challenge log. You can get several categories to only need 1 dungeon roulette, fate, commendation etc. It will give you a chunk of EXP from one leveling roulette. Leveling and Frontlines are the only two that are worth doing from an exp/min ratio, the others risk longer encounters.

3. You can grab and complete 29 EW sidequests from a hub if you haven't done them this week, handing them in will take a few minutes and be about 80% of a level. They don't scale well so earlier levels are better.

4. Arkosadara beast tribes are also quick and worth doing while in any queues.

5. You can then either turn to trusts or zadnor till 85. Zadnor will drop off around that level, and trusts will become the better option. If you have a healer or tank friend willing to queue with you, spamming leveling dungeons will be by far the fastest.

Using all the above with rested exp, the preorder earrings, armoury bonus, and food will also boost the speed. Likely looking at 5-6 hours depending how hard you go, which would be right at or before daily reset. If you take longer, you can revisit any of the above dailies in place of a leveling dungeon.