It really depends on the baby. I introduced bottles to my newborn very early and intentionally provided a large range of brands so she would still prefer the nipple. When she was 6 weeks old, she went on a total bottle strike and I had to latch her 100%. She only started taking the bottle again when she was 5 months old. Perhaps you could try a bottle similar to the nipple, like MAM or NUK latex. These two have very good reviews from BF moms.
Thanks mummy, LO refuses MAM but is taking to NUK well.. she finishes 120ml in 10 mins when bottle feeding which is worrying to me too. and i'm afraid she won't want to nurse anymore since during nursing, we will typically take 30 mins..