The length of buffs is dependent on the level of the character they are cast on and that is set in the spells file. Each buff uses a formula to calculate duration based on level and to adjust that would mean adjusting the formula for every buff spell on the server. It can be done, and probably even with a simple mysql query or 2, but it isn't anything that can really be adjusted in the code as far as I know. The only thing I can think of would be to code something that could change how the formulas are handled by the server.
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