Invisibility 10' Radius duration bug

[aVENGER_(RR)]

According to its in-game spell description text, the invisibility effect of "Invisibility 10' Radius" (SPWI307.SPL) should last for 24 hours (7200 seconds) or until it is broken. However, in the unmodded game it merely lasts for one hour (300 seconds). I'd be much obliged if you guys could fix this, since I intend to use the spell in one of the Rogue Rebalancing quests.

[Azazello]

Known issue: http://forums.gibberlings3.net/index.php?showtopic=8726