Rule of thumb for me is no play one hour before and one hour after. Minimum time for me is 45 minutes on either side. In the morning I feed him right before I leave and he has all day to hang out. At night he eats and we just lay there. He doesn't play unless it's with me so I don't play with him for at least an hour.
Commander Charly Titan (GSD)-15 Jan 2010
Lady Athena (BB)-2011-2012 (RIP baby girl)