This(corrected one spot though - it's 3 roulette and 5 dungeons):
Too many people forget the challenge log exists, and has some decent EXP rewards. Just doing your normal Roulette's you can easily finish the dungeon and commendations parts of the challenge log. Even if you do your EX Roulette, then switch to your tank and do all the others(even do your Main Scenario, even though it might take longer, you can net 1+m EXP with the daily run of it) you can do those in 1 day if you run 1 additional dungeon after your roulettes finish(EX>50/60>Leveling[3 Duty Finder Dungeons done]>Trials>Main Scenario[Commendations done if you had an empty slot in party for a random all the way from start]>Guildhest[lowest EXP reward, but still EXP]>Frontline>highest eligible dungeon[5 dungeon complete]). This get's those weekly challenge logs done in one day.