I was wondering about this recently as well. Victoria is only 6 weeks old and the last 3 or 4 nights she has been going 8 and a half hours between feeds at night. Last night I gave her her last feed at 7 then put her to bed. She woke up a few times, but was fast asleep by 8pm. She then didn't wake up for a feed until 3.30am. I am a bit concerned as this is a very long time between feeds at such a young age, but she seems very happy and is still ganing weight