How long should i walk Archie?

There a field about five mins from me. With him walking on grass its easy going for him he 15 weeks now loves walking. How long should i walk him?

I think the general rule is 5 minutes for every month. But you can walk him more on grass than on a hard surface, and you can do more off lead playing/running around than you can lead walking.

All I'd say is don't exhaust him.

thanks i takes him out for around 20 min. he comes home and still charges round like a mad fool.