My son is 2 weeks shy of 6 months old, and I still can't get him to do much more than a 3 hour EASY schedule. We're still at 4 naps. Once every few weeks he will take a longer afternoon nap and I will think we're having a breakthrough, and then he just goes back to his usual 45 minute naps.
He is EBF and I do not plan on starting solids until he hits 6 months old. Right now he will not even really take a bottle, so I don't have any clue how many ounces of food he gets per day.
What ends up happening is that his wake times are extending somewhat, and spreading out his feedings is not really working, so he's not really on a strict EASY schedule, instead often eating in the middle of his wake periods. I have just been making an effort not to nurse him to sleep (don't want to create that sleep crutch), and feeding him when he needs it in between naps.
He cannot stay up more than an hour and a half most mornings after getting out of bed. I have tried to keep him up longer, but he is not just fussing because he is used to having a nap, he is falling asleep playing at about the 1.5 hour mark. When he was 3-4 months old, he could barely make it a full hour, so in some ways I'm not surprised by this. I have been trying to keep him up longer for the later wake periods, only putting him down when he truly looks sleepy (yawning, eye rubbing, staring into space and trying to disconnect from interacting with me), but he still only does 45 minute naps for all but his first nap, and even sometimes that first nap is short too.
He is capable of making it past that 45 minute mark at night, but just not during the day - on a good night he will sleep from 7:30PM-4:00AM without waking up, eat then, and then go back down from 4:30-7:00ish.
Typical day for him:
7:00 - Wake/Eat
8:30 - Sleep
10:00 - Wake/Eat
12:00 - Sleep
12:45 - Wake
1:00 - Eat
2:45 - Sleep
3:30 - Wake
4:00 - Eat
5:00 - Sleep (I'd love to get rid of this, but he can't stay awake from 3:30 until bedtime without having another nap somewhere, even if we push bedtime up to 6 or 6:30)
5:45 - Wake
7:00 - Eat/bedtime routine
7:30 - Sleep
4:00 - Eat/back to sleep immediately