Takes approximately 20 minutes to solo for a 52 bard. Your best bet is to use a SoW potion and run backwards from him in circles around the island. This way, you don't outrun him, it's hard to get a camera view that will work around the whole breadth of the island.
And all you guys talking about half a blue bub. He's nowhere near that.
Out of 6 of him, I got 3 ruby crowns and 2 fire emerald rings. Still looking out for BD's and D's