What do you think Alucards Regeneration level is at?

I've only seen the first episode, but I'd say unearthly or even more. This is because his physical stats are probably quite high, and thus it takes a higher regeneration rank to bring him back to perfect health in the time demonstrated on the show. At unearthly, it would take one minute to recover 100 health out of what I think is maybe around 150 to 200. So I think it makes sense without going overboard giving him uber-regen.