Times to take read after meal

I've seen various remarks on the time for taking a read after having eaten.
There's the 2 hours after a meal, the 2 hours after first bite and then I read that one and a half hour after having eaten is the peak for glucose rising and best time for taking a read. All of this gets confusing after a while. So, what is the best time for taking a read?

When I first started I was doing 2 hours after eating then someone said to do 2 hours after first bite. Like I said, it gets confusing.