You can globally change the length of the debuff timers in Target Info by editing one of the XML files. Open
Target Info.xml in notepad, and search for
<option text="I" data="60"/>. The text field is the level of the spell, and the data field is the spell length in seconds. You can change the debuff lengths for both creature and life spells there, but it'll be a global effect for all debuffs cast by anyone.
Chances are I won't be updating Target Info soon if at all... If I do update it, it'll probably be a complete rewrite in C#, since I really don't want to have to deal with VB6 any more
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[LotRO] Digero (Guardian), Digrim (Burglar), Dignite (LM), Azrea (Hunter) - Landroval
[AC] Digero, Lyera, Draxxe - Leafcull (Retired)
[CoH] Devil's Zealot, Scinta, Izzard - Guardian (Retired)
Digero's AC Decal Plugins:
http://decal.acasylum.com