Honestly, there really is no time limit on how long content should take.

Each and every person takes it at their own pace. You enjoy the game most when you play it with people who take it close to your own. Merchant guilds who play the market boards, casual guilds which are jack of all trades and master of none or hardcore guilds who sit at the front of progression.

There really is no set pace. The best thing anyone should do when playing MMOs is figure what pace they like and then find people on the same page as them.