Hi Quill, no i dont think thats too far at all! IMO, puppies can go as far as they can go
Its all about building up to it gradually - from your post, i assume you are already taking her for short 5 min walks? I would build it up to 10 minutes, then 15, then 20, etc etc. Honey would walk for half an hour plus by the time she was 4 months - she just wouldnt tire for ages, but would let me know when she reached her limit - by stopping and pawing at me for pick ups generally! She now walks 3-4 hours per day and we also go for long walks up hills and mountains some weekends for 3-4 hours at a time. x