All of it!
The time of our peak will vary depending on what we eat. Various foods slow down the conversion the carbs to glucose - fats mainly, also some fibre. It is possible to peak at 30 minutes or earlier if all you eat is a banana mashed up with sugar, whereas if you eat a balanced meal it is likely to be between an hour and 90 minutes, whereas with certain other mixes of food it may be 2 and a half hours or 3 hours sometimes. An hour to 90 minutes is probably the most common.