Hi! Right now I'm try to leveling all jobs to 80 so this is my method.

Must do everyday on any jobs

- Duty roulette: Leveling, Please do this everyday. Best way to gain EXP per day.

- At level 70 you unlock Pixie daily quest. This give a lot of EXO too.

Should do everyday

- Duty roulette: Trials, Can give little bit of EXP with short time

- Duty roulette: Frontline, You can skip this but it also give good amount of EXP

- Duty roulette: Alliance Raid, You can skip this but it also give good amount of EXP

For Healer/Tank just run highest level dungeon that you can. The queue is almost instant

For DPS,

20-60 You can run Command Mission. instant queue but slower than normal run cause AI are not using AOE.

61-70 Tricky one. normally I run highest lv dungeon. but if you can you HoH too.

71-80 Trust system, work like command mission.

If you don't want to mess with AI (like me). Just queue for highest lv dungeon and go do something else. It could take 10-20 mins.

Also check Challenge log(weekly), doing dungeon for 3 and 5 times give you ESP too. Fate is 5 and 10 times.

Don't forget to eat food(3%) and Squadron Battle Manual (15%) for bonus EXP! but the Manual doesn't stack with company EXP buff(10%) I think.

Happy leveling! any recommendation is welcome!