My first daughter was a good night sleeper from birth. She'd feed at 8pm, 10.30pm, 3.30am and 7am right from birth.
Ashley (11days old) feeds 2 hourly around the clock. She clusters in the evenings, is wakeful from 11pm to 12am and then wakes at 1.30, 3.30, 5.30, 7.30, 9.30....etc. (in fact, she woke every 1 hour and 50mins exactly last night)

. She continues to feed roughly every 2 hours during the day too, occassionally going 3 hours. She feeds extremely well at every feed, sucking and swallowing for 10mins on each side very effectively.
She doesn't like her own bed at night so it takes me about 1 hour from the time she wakes until she is back asleep which leaves me just under an hour to sleep between each feed.
Is this 2 hourly business likely to last long?