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A counter drain has a 70 second cooldown. Removing 5 seconds, would allow it to become 65 seconds, a 7% decrease. In ~15 minutes, you can do an additional counter drain compared to 10% damage, from 14 to 15. Meanwhile, you would have already done additional damage worth of counter drain from the 10% damage on the 10th hit, and accumulating increments even if you dont reach the 10th, while you need 15 min for the -5 to be worth it.