Game Ending

I would like to know when the game guild wars ends.
I think that I must do the primary missions but then how is it that sometimes I get a primary mission and when I finishes it and then talk to the same person who gave me this mission, he does not have any job for me.
How will I be able to know how much time I should wait?
thx

The game ends at Hell's Precipice, a mission area in the Ring of Fire.

The game is supposed to link together with Mission --> Primary Quest ---> Mission etc. Some places there are breaks in them, so just ask for a group going to the next town and im sure you'll proceed fine.

I think maybe you are confusing quests with missions. Missions are where you go to an outpost and hit the Enter Mission button. You don't receive them from an NPC at all. If you are talking about the Primary Quests, the point of them is to lead you to the next Mission area.