I would say that making it to level 50 in a month is basicaly impossible.
Only if your not in a static party, I've leveled from 33 to 41 in roughly 21 hours (spread out over 3 days in about 7 hour sessions a day)

But if your not in a static party then ya it's impossible cause there's too many newbies and jerks out there who will stop your progress inbetween your not getting invites (unless your bard or white mage)