perfectly normal. can be more, can be less. but around 2~2,5 hrs is just right. some babies, i.e. mine
, 'jumped' from 2 to almost 3 hrs at 6,5 months. but it all depends on the baby.
try doing bottle plus solids 1,5 hrs after the bottle. than maybe diaper change and off to bed for a nap.
don't worry about not dropping 3rd nap just yet. some babies need it more than others.
Monika