Durge can't be physicall killed, so Revan would probably just force drain him or destroy his mind or something.
Hey Zeph, do the cambatants know their enemies well. If Revan knows everything about Durge and his species, he will know to pull off a force drain or destroy his mind and will win in about 3 seconds (Ventress is not an issue in this fight), otherwise would probably take time to figure out Durge's weaknesses. However he is incredibly smart and it wouldn't take him too long.
I wouldn't be surprised if he already knew of the Gen'Dai and was able to recognise Durge as being one (Revan was very knowledgeable).