juski, my girl latch on total 45mins - 1 hours then can sleep for 4 hours.
but like just now, skip 1 nap due to visitors, the feeding total took me nearly 2 hours, she slept immediately after feeding at 10:30pm. and still sleeping now, i am pretty sure that feeding can last at least 5 hours sleep. so expect her to wake up at 3:30 later, i got nothing to do besides surfing net now, cuz i got slept 3 hours, and that is enough for me now.
she normally close her eye while sucking, but she is awake, so suck non stop. i will put her down if i felt she is too sleepy to eat. then she can wake up cuz she is not full. so i know if fast the feeding is about 45 mins, but if she had 5 hours sleep before feeding, she can eat for 2 hours, until she 'smile', it is a sign to show that she is full. if no smile, most of the time she is not full, looks like sleeping liao but once put down she will search for nipple again.
she is the type that she will eat till fall asleep on her own de, so unless she is full, if not she will be awake and keep searching for nipple de. that is why i need to read the sign to tell if she is full. very simple if i interpret wrongly, the most carry her up to suck for few more mins, she fall back to sound sleep again the put her down loh.
think you can try to leave him there if he is latching on for the sake of playing with the nipple in the morning, i use that method to keep my girl awake 2 times now in the day. just feed her 80% full so she won't be able to sleep. like that can skip 1 or 2 nap so she can differeciate day and night, but at night i make sure to feed her for longer time till she is 100% full before i put her down. i felt your boy is very similar pattern as my girl. my no.1 was also like that last time. but her sign of showing full is very obvious, once her toes stretched out and looked relaxed, means she is full. so i guess you just need a bit more time to observe and understand some body lauguage of your boy, then will be even easier to take care of him.
will your boy prefer bottle later on? i did not use that cuz i scared later my girl prefer the teat and lazy to suck, like that my milk supply sure drop.