
A dog of an active breed really does need free running excersise. In my experience owning a very independant breed recall training and off lead is best started as soon as possible (in as safe an open area as you can find).
Very young puppies are less likley or able to run off far from you, as being so young they will want to stay close to you for protection.
Waiting until two years old will have you most likely with a dog that will say yippeee, freedom at last, see ya later!!!
I still have problems with my four year old bitch, who sometimes still won't come back until she is ready, and she came back to live with me at nearly 9 months. She had too much confidence. She is about 85% reliable, so I just ensure I only let her off in the safer walking areas, and when I am not in too much of a hurry.
Obviously training the recall on lead, in the home and in the Garden where you have control is the firdt step, and should be kept going along with the free off lead time.
Her baby daughter 12 weeks today will be let off lead when I go to the park, but not with her Mum!!!