We know that Steven intends for leveling to 50 to take about 45 days at 4-6 hours a days. So, 180-270 hours. Presumably, that that estimate of leveling time is intended for those who join on day 1 of release. Players that join on day 1 and play actively will have a slower time to level as those players will need to wait for the nodes to develop or the player will need to level against mobs much lower level than the player or complete quests that are intended for much lower level players. So, players that start on release take 180-270 hours to level but that is very slow leveling due to undeveloped nodes.
If all this is right, then a new player joining a few months after release and going to a metropolis area while reading a couple leveling guides will probably level to max in far less than the projected 180+ hours.
I think that when the leveling speed balance is tested in A2, IS should aim for the 180+ hours to be the target for players that join late and can immediately go into developed areas. This means that the leveling speed would be much slower on release; but, the intended effort of leveling can be maintained for the life of the game.
What do you guys think?