http://eqdb.allakhazam.com/quest.html?quest=362
http://web.archive.org/web/200104202...html?quest=362
having a hard time as mentioned before w/ nailing some solid info on spawn, but in the comments here you have a mention of 7hr and 12hr.
Other comments throughout epic walkthru on allah suggest both those times as well.
Comments before that on allah's on wayback seem damn hard to find, and everlore had no info. No walkthru's for FD or Soulfire mention any week spawn, which I would think if it was a major issue or roadblock it woulda probably made its way into the walkthrough. I also remember helping 2 guildies with the quest in a very short time, but that is so far from any concrete evidence..
Still lookin, dunno if this helps?
Cant seem to get links workin right ;p but its apr 2001 on wayback Soulfire walkthrough.