But if you use any of the thread suggested melee-based combat class stats to test this you won't be doing 30 swings worth of damage, the player will die before that.
And that's pretending that the aggressor doesn't even use any hero skills.
If we actually think this number is worth it, we should test it, but I would expect a Sharp4 enchant to add somewhere around 50-80 damage per fight max, depending on the classes involved and their builds.
Don't be rude AND wrong, it's not a good look lol
Edit: obviously if implemented, a meleeing caster (or other non-melee) could have the potential for a sharp enchant that adds much more than 120 total dmg over the course of a long fight against a tank. Yet another consideration to remember is that this percent dps increase varies among stats and playstyles, and will have a stronger % buff effect on low melee classes and a less strong buff effect on certain medium melee damage attribute builds or on high melee classes.