Hi Kitty32, welcome to pets.ca!
It's different for each cat, but typically one poop a day is about average. Sometimes my guy will go every 2 days (he also eats a raw diet quite often, which creates less waste), but if it gets to be 3 or more, I start to get concerned. If Zeus is still eating and acting normally, I wouldn't be too worried yet. What does he eat? Perhaps giving him some wet food will help, since constipation is often due to dehydration, and dehydration is frequently the result of a dry food diet. This link has some good info on feline nutrition, if you're interested: www.catinfo.org