I'm trying to think, I can't come up with any static zone spawn or even instance lockout timer over 7 days.
3, 5.5 and 7 have been pretty typical throughout EQ's life.
I suppose it's possible this one was stupidly long and thus the fix but it's probably more likely it was a 3 day for a bit or something.
There however is almost no information on Tormax before this date.
http://www.legacyofsteel.net/Archives/Post/2001-04-10
http://www.legacyofsteel.net/Archives/Post/2001-04-14
This shows Tormax kills April 10th and 14th, suggesting 3-4 day respawn. Also the tski patch note archives only shows patches on April 4th and April 17th, so there wasn't a scheduled downtime in between this window.
http://www.tski.co.jp/baldio/patch/19992002.php
There however may have been server instability or an unmentioned patched in between April 10-14th which brought the server down and re popped him, but this is probably impossible to prove.