The last photo of my baby. How long before I stop looking for him?

My sweet, silly, smart, goofy, fun-loving boy crossed the rainbow bridge yesterday. His cancer came back in his remaining back leg and he deteriorated quickly.

It was so peaceful and he was so happy to be outside in the cool weather with a ball. I held him as he went and told him I love him and that he'll always be my Puppy.

How long before my subconscious stops looking for him?