You do know there is a happy medium somewhere between stopping every ten feet for a full minute and being only allowed to stop a few limited times?She walks 3 miles a day. If she stops every 10 feet for 1 minute each stop, the walks will take 4 hours. I don't think so. I know where my old dog stops to sniff; I let her stop there.
I am asking the following question as a real question, not sarcasm or rhetorical--- what at all connection is there between where your old dog stops to sniff and where your puppy who is just learning about the world is allowed to sniff? Scents change-- new dogs and cats come in and out of a neighborhood, dogs have different sniffing priorities, seasons change scents, even just the difference between trash/recycle day vs not makes a difference in what attracts a dog's nose.
Sniffing works the mind, it adds a lot of value to a walk. A regular human paced walk is minimally for exercise for a young healthy dog and more for learning, experiencing. I like to train "Let's go" or "Walk on" and will mentally count down say, 20 or 30 seconds at a spot before asking for walk on. I keep the time consistent and the dogs tend to pick up on the idea that they get a bit of time to sniff but can't spend all day there either.