I buy 2 packs of 12 12.5oz cans about once a month. I'm only buying 2 flavors of Wellness right now. I only buy wet food for my foster kitten and she does not do well on Evo sadly. She did well on Merrick BG but the 5.5oz cans aren't affordable with her appetite. She eats a lot, probably too much. I'm giving her about 10oz a day right now. That's around 400 calories. She'll be 5 months old tomorrow.
So yeah, I buy food for her about once a month. My cat eats dry food and I buy a bag every 4 months or so.