When and how do you drop to 2 naps?

[123456kent]

My dd is 7.5 months and currently has 3 naps a day.
This is becoming awkward though, as she sleeps in (usually - things do vary a lot) until quite “late” (which I enjoy and don’t want this to change too much!!) to 7.30am ish and her awake time in between naps is getting longer and longer and her naps are getting longer too - particularly if in cot.
There’s not enough time in the day to fit in 3 naps sometimes.
But if I try and skip 3rd nap and stretch her to bedtime she wakes after a while and is very distressed at us trying to get her back to sleep - to her she’s woken from a nap and wants to be awake for a few hours.
When should I expect 2 naps to be ok, how do I transition to this, and what would an ideal timetable for a day look like?
Early bedtimes don’t work for us as Oh not home from work until late so 7.30pm is usual bedtime.
She has ‘slept through the night’ once or twice - but usually makes it until 5am ish without a feed, then breastfeeds and goes back to sleep.

www.babysleepsite.com/schedules/8-month-old-baby-schedule/
www.babysleepsite.com/schedules/9-month-old-baby-schedule/

On here they make the transition at 9 months. Don't know if these are useful. Strange how your baby still things they are napping, my 5 month old is fully aware of bedtime despite number of naps- do you have a clear bedtime routine? I've read some research which shows those with a clear routine sleep better.

There's also this... ANOTHER sleep regression...

www.babysleepsite.com/baby-sleep-patterns/8-9-10-month-old-baby-sleep-regression/

Yep same thing every night, she doesn’t feed to sleep on any naps but we do for bedtime, and have other things that tell her it’s bedtime.
But the few times she’s had 2 naps, she’s awake an hour or two later really crying if we try and get her back to sleep.
If she has 3 naps then after bedtime we don’t hear from her until 5am ish.
I will read those links, thanks. So 9 months is probably when I should try and drop her down. Not that I am pushing it! I love the break that naps give me!!

What times are the naps?

Watching this one closely as my DS is only having 3 x 30min naps but even these are a struggle. Randomly he will pull of a 1.5 hour nap (maybe once every 3 weeks lol) Got to be the development thing here I think.

Our days aren’t really the same as she wakes at different times and her naps vary in length, but a normal 3 nap day would be:
7am wake up
9.30am nap
1pm nap
4.30pm nap (short one)
Then bed at 7.30pm
It’s usually quite successful, as she’ll then go until 5ish, feed, then back to sleep.
She’s obviously not ready for 2 naps yet, perhaps I will try again in a month when back from summer holiday (or perhaps the holiday will signal a change in routine entirely)

How long are the other two naps?