How long in minutes after a meal will blood glucose level be highest for a type 2 diet control diabetic?

Peak of blood sugar. Blood sugar generally peaks one to two hours after a meal. This number is just as important as fasting blood sugars are.
At 45-60 minute. But can also happen at 30 minute depending the type of food being ingested (fatty food mixed with carbs tends to delay the absorption of glucose from intestine).
An hour. Depending upon your personal glucose tolerance curve, the highest blood sugar would occur in the one-half to one hour range.