10-15 minutes is a long time for a puppy!
Puppies of any breeding generally have the attention span of a
couple minutes at best. Keep play sessions and training sessions
short and exciting, 10-2 minute daily sessions is better than one
20 minute session
Let your puppy be a puppy, don't push him to be a grown dog.
That will happen all on it's own, and sometimes way too soon!
Keep his access to toys limited, why would he want to play with
you or anyone else when he has a toy store in front of him at all
times? We always want what we can't have theory