when we were in full swing my labs were out working 6 days a week up in the Yorkshire wolds, some shoots i was beating some picking up, and they were brill, I have one bitch I use for rabbit shooting and she will peg runners, as for stamina and drive, the father to my bitches, swam a half a mile lake to pick up a winged goose, and never gave up a good working lab will have plenty of drive and stamina