Enable your body and brain to fulfil their evolutionary role: to walk and run efficiently, on demand and without injury, throughout your lifetime.
To achieve this requires a gradual transition as, unless you were brought up in an unshod, chair-free environment, you are likely to be lacking in certain physiological qualities and biomotor skills for natural human movement.
Taking a few steps back before you eventually leap ahead will be hugely beneficial in the long run. Everyone will adapt at different rates so there is no set time limit to each motorskill milestone. Simply perfect each one before moving onto the next and ensure you give your anatomy time to recover and adapt.