A guidance routine at 6 months would be 3hrs A, 2 long naps. So something like:
WU 7
A 3
S 10 - 11.30
A 3
S 2.30 - 4
A 3
BT 7
But bare in mind we rarely have such perfect routines like that as it depends on LO. Some LOs like longer first A and shorter after, some do 2hr naps which changes the length of the day, some do shorter nights and will not do 12hrs... so it really is only guidance and not a schedule to adhere to.
Rather than CN, long nap, CN, you be looking at combining those 2 CNs into 1 long nap to make 2 long naps.
Solids are usually introduced at 6 months which sometimes means LO can go a bit longer than usual between milk feeds as they are getting a bit of something between (which accounts for the A time plus nap time equalling more than 4hrs also because LOs will tend to wait a bit longer between E if they are sleeping).