You CAN hit the cap in a week. But it'll be a boring grind. You'd have to fate grind all day long, do leve quests and bang out the roulette's you have. At 44 you'd go for speed runs to 50. I did it in 2 days from 44 to 50 simply because it's boring. Also, it dependent on the class you play. If you play a healer or a tank. You'd find a duty finder match in 4-5 minutes while a dps might have to wait 20-30 minutes. There's a few things that can help also. Buying food of the market gives you 3% bonus. And the rested bonus is nice aswell. After you hit 50 with one class you get a permanent bonus for any other jobs you want to level. Ofcourse this is all hardcore gaming. If casual. I'd suggest you do all the story quests. Do your leve quests. Focus on 1 char first. Find 3 friends to play and level with you. And than you can casually get to 50 in a week or 3 maybe 2,5 or so.