though the early game is a lot to take in and learn but it all disappears by the time you hit 20
pvp from 6-15 then do the adventure that unlocks 15-20
after you just finish the zone stories and you should be 48-49 depending on how many tasks you skipped.
49 you can go to crimson badlands, then pvp the final % or grind them out.
took me about 2 days played, it's possible to do it in 25 hours, though you have to be a stalker for that.