I don't think that's unusual after heavier meals that include fat. I've had pizza cause a spike at 4-5 hours, which makes me wonder who created these guidelines. I guess they're all eating fat free diets? Low fat meals on the other hand should be close to normal by two hours, otherwise there's a potential problem. The OGTT of course includes no fat or fiber. I completed one recently and didn't feel so great, kind of dizzy within the first ten minutes and by two hours I was hypoglycemic. It would have been nice to have markers past two hours...live and learn.
I agree with the eOGTT revealing more.
That is why this test should always be fasting.
Fat, is always an issue with dietary recommendations. Mainly because of this low fat issue, usually ascribed to saturated fats. The majority of saturated fats are good for your health, especially if you are prone to glucose/insulin response issues as it does slow the spike. It does not cause cholesterol issues or changes to your hormonal response, if you have satured fat moderately, as in all things!
The other non saturated fats or low fat are not as good for us. Low fat is known to have the fat replaced by other baddies, ingredients that are known to affect that hormonal response, industrial sugars, oils, such as palm oil, soya, others for taste. Even most cooking oils are known to be bad for metabolic issues.
The reason why, that recommendations are so skewed for us, take for example the glycaemic index, it wasn't tested on anyone who had diabetes, only done on non diabetics, with no health issues. Because they wouldn't be able to have a baseline, guideline.
That is why, when I was involved in how dpp4 inhibitiors could help with first phase response, that my endocrinologist, only had two patients to test! But it did show exact response. And a paper was published.
And eventually, my specialist endocrinologist had to alter his treatment advice for those with RH.
But I will add that, as with most things to do with our health issues, it is so individual and what causes or treatment works, is for you!
Best wishes.