I had a dog out of rose x gc joe called rosco which had unbelievable stamina as seen on fen fever when he had an 11 min run caught it, trouble with him was he always took so long to make a kill, it would take him 4 or 5 min to kill an average hare which should of been done in 2 min, he didn't seem to want to pick the hare up till he had it nearly walking but then would put some mad strikes in and roll over with it to make a kill, think he just liked running and didn't want it to end to soon, you could slip him on a hare go to the nearest shop for some butties and a drink come back and he would