this year me and my lamping partner has had 4 between us, and believe it or not due to niggly injuries theres times when we havnt had anything to run, this year we'll have 2 pups to bring on aswell so thats 6, but we are out, every fri,sat and at least once thru the week, if the weathers there it can be up to 5/6 times a week, and i'll sqeeze a nights ratting as well for the terriers,
as long as they are getting plenty of work, good grub and clean dry kennel, and youve got the time to give them a couple of clean out walks everyday i dont think you can have too many