It of course that varies from cat to cat and depends on how the CG can feed.
You will have seen that folk recommend feeding every 3-4 hours, and that is what I do with George, the difference being that he is off the juice now, and that's what is easiest on his pancreas, also when folk are approaching remission a small snack at +9 can stimulate the pancreas and help bring the numbers down, but we are talking about cats here that are on micro doses and who are holding their BG in the normal range for a healthy ca but popping up to over 100 for PS, then the small snack late in the cycle can help to drive those preshots down. The assumption is that the pancreas is starting to work at this point.
With Kitties just starting out a feed in the latter part of the cycle can have he effect of boosting the PS numbers, since we know that Lantus does better at grabbing onto lower numbers and then running away with nice flat cycles, it makes sense to try to avoid boosting those PS up.
If you look at Georges ss, we changed his feeding schedule as we went along,
first we started with amps meal +5 meal and pmps and +5 meal (four meals a day am and pm cycle the same)
But we found that with that schedule, he had a tendency to drop hard and fast at the beginning of the cycle.
So then we changed that to more regular feeds in the early pat of the cycle.
The intention was to give him a snack at
+2 +4 +6
Though I did vary it from day to day, depending on a number of factors, including if I had to be out, if he was begging for food (often if he was begging it was a sign that his BG's were going to drop). But if you look at his ss, you will see that nearly always his feeds were done before +7, on the occasions that I fed after that was because I got a later test that was low and I was concerned that he might be too low to shoot, so I would give him a little LC snack to tide him over a small teaspoon or two of LC. Equally if I had to go out and I was worried I might feed him more snacks in his morning cycle to be sure he had enough food in him.
Then later as we got down to 0.25u, that's when we started the feeding schedule that he is still on, main meals at amps and pmps with snacks every 3 hours, so that it's easy on his pancreas, also he has early CKD, and as CKD cats can have problems with acid tummy I implemented this regime to try to prevent any issues with that.
Having said all that, I know that Ozzy has had problems with DKA and ketones, so as well as wanting to get his numbers down , you also need to be sure that he is getting enough food into his system, and that may well be why you have been advised that 3-4hrs is a sensible schedule for Ozzy, just going to tag
@Marje and Gracie I'm sure she'll know if it's preferable to keep to a 3-4hr schedule in Ozzy's case. (I haven't had personal experience with DKA and/or ketones)