
The pup can't be taken for long walks. 5 minutes per month of pup means your pup would only need a 15 minute walk if he could go out. I know that he is not of a size that you could carry around just for socialisation.
Many people actually do take pup out before the recommendation, but, of course, this is up to you.
However, even as an adult, it wouldn't be right to let you think that a 3 hour walk will suffice. My BC would be comfortable on a lot less. It is not just physical exercise that they need. You do need to learn how to exercise his brain. This is a dog that would be totally unhappy if he is not encouraged to think. How much interaction do you have with the pup indoors?
Seek and find games can be fun, and will tire a pup faster than a walk. Teach your boy. :-)