The key quest is relatively short, and requires no faction work.

IN the chunk LTT, theres a monk outpost, one of the monks gives you a quest to go into the jin forest and complete 4 trials.
The 4 trials are given by oversized ghosts in the forest, each of the ghosts only wants something like "kill 10 cockatrice"  Once youve done the quests for all 4 brothers you complete the key.

It is douable with a disciple, however I would recomend being 22-26 if you wish to dou it, 18 if you will use a full group.

You can start at 18, the hardest part is inside LTT's tomb itself you will need to find the sword on an altar to start the quest, then you will need 4 gems that are semi rare drops from inside the tomb, after that the rest of the quest is outside the tomb in the jin kai forest so it goes much faster.

No clue on game hours, it all depends on how fast you kill, and how fast the drops come, at 50 i can finish the entire series in about 2 hours.

PS the weapon is heroic if you complete the quests

It all depends on level

IF your 14, do the entire URT, youll be 18ish when you finish and have 5ish pieces of rare armor.  Then go to upside defense and do the shoulder or helm quest, for the hunters league then head off to skarwala rock to do the chest/legs/weapon. (Id skip most of the HL as possible, the shoulders/chest./legs/weapon are the only good parts)


If your 18 ish do HL shoulders, chest. legs weapon. The do LTT after wards (reason being is youll be a higher level and LTT is harder to get groups for so soloing it will be easier.