ive only seen 1 greyhound bitch used in the field over the last 20 odd years. a ex flapper when fit she took daytime hares in my area on big open fields and could manage a lot more than 2/3 turns of a hare and quite often she didnt need to. certainly couldnt compare with a saluki based dog stamina wise, but you could go out with her and get a hare for the pot and her owner was happy with that.