From about 7 weeks DD slept from 8pm - 7am, but I woke her up for a feed before I went to bed at 11pm up until she was about 5 months (not sure that she really needed it, but didn't want to chance dropping the feed!).
She's now 2.3 years and sleeps from about 7.30pm until I wake her up at about 7.30am. At weekends when I don't have to be at work, she often goes until about 8.30am or 9am - bliss!
Since she was about 6 months old I think we've only been woken up at night by her about 5 or 6 times.
I didn't follow any kind of sleep training program, as I saw how stressed out some friends got following routines from books, although looking back I suppose that we used controlled crying to some extent.
I'm actually quite scared that if we have another child they won't be as good at sleeping and I'll really struggle.