I have a 7-year old, 85 Ib chocolate lab who could use weekly visits on most Mondays (for now) and possibly Tuesdays (starting April). Anytime mid-morning to early afternoon is ok. Play fetch or take a walk in the neighborhood, plus a refill of the water bowl. 15-20 minutes is sufficient (definitely don't need a full hour but I can't choose less using the options above).