Puppy Feeding Times

At what age should you stop feeding a puppy three times a day?
He is a cocker spaniel
When not eating its good food and shows very little interest, go to only twice a day, I had when I was about 3 months.

At what age should you stop feeding a puppy three times a day?
He is a cocker spaniel
When not eating its good food and shows very little interest, go to only twice a day, I had when I was about 3 months.