you never get through a season of proper work with one dog,going half arsed odd night / day maybe, my current runner goes more than once a week but that might only be one or two runs daytime, ore 3/4 rabbits night time on average so not hammered, my spaniels on the other hand do 2/3 full days a week and towards the end of the season i start nursing them along by leaving some off here and there, as they are a bit full on and never stop, so i dont want them burnt out.