I tink quite normal, sometimes latch longer for comfort n nt really drinking.. Mine same. Once i see his throat not moving means he not swallowing i will unlatch..or can see if got milk at side of mouth means still drinking.
I also use hot water in a cup ! Lol.. Cos sometimes warmer really too slow, or when im outside i jus bring hot water flask, but is not boiling hot lah, just mayb like 80 degree kind.
Sometimes jus need close 2 eyes, since u alr pay for her service, later she not happy anyhow anyhow u more headache. Ya jus complain here to us or ur family lor.... Sigh.