Quest's sind allerdings nichtnur Gm beschränkt, es gibt viele sehr gute Quests, die so auch von Spielern ausgegangen sind, hast du eine Idee für ein Quest, dann frag einfach einen Gm ob er dir hilft oder "zieh dein Ding alleine durch".
Usually, quests feature a series of problems and related goals. Quests require actions to be fulfilled, starting with simple tasks like "Take item A to person B to receive key C for door D behind which you can find item E. Bring me item E for a reward." or for the more advanced players something like "Build castle A for villain B in order to stop disaster C, afterwards find allies among D, E and F and force villain B to surrender his magical uber-item G to character H to save the world."
The duration of quests differ; some quests, like the drought-quest and the quest for the astral eye (ahhh, good old days!) took serveral months, including many side quests and featuring various sites and sub plots. Most quests take 1-4 hours, though.