It don't matter long as they get it over ,many moons ago a mate had a grew that was probably the best dog I've seen it was well brave aswell got eaten 2 death nearly a few times but never gen it best
Fair play if it got it over in 3 seconds it would do me mate ,but out of interest, try timing a run it's mental how long a minite is and most hares piss off out the beam if allowed that sort of doss