For Sienna, it seems to be HOURS. She doesn't seem to just stay at her bowl and eat until she's finished the portion. She eats (or licks) a bit, then wanders away and returns a while later. And a while later. And so on. Sometimes it seems to take her hours. Should I be doing something differently to encourage her to eat it in a shorter period of time? Or is it okay for her to graze on it.? It is canned food.