It couldn't have been changed *too* long before April 2000 because here are people still talking about DS lasting longer on mage pets on April 20th 2000:
Quote:
4/20/00
A druid needs to straighten this out. In summary, a mage damage shield will
always hit harder than any other. It provides some fire resistance as well.
It lasts about 5 minutes on a mage pet and 2 minutes on anyone else.
https://groups.google.com/d/msg/alt....A/QLgO03UkyVsJ
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Somewhere between 2.5-3x normal PC duration based on the two mentions so far.