Dear Sam2,
Thank you. I agree that a small kezayis and two minutes go quite well. It’s obvious that one cannot reasonably hold the maximum shiur and the minimum time. The average yeshiva bochur ( see comments above) thinks that the halachah applies only to strong able-bodied yeshiva boys. But it also applies to twelve year old petite girls, who cannot wolf down large quantities of any food at Olympic speeds.
I have my own way of doing it. I am machmir in time, two minutes. Whatever I can eat in that span at a reasonable pace must be a kezayis. Although I hold a minimum kezayis shiur for my family, I am always surprised how much I ate. It is quite alot, far greater than the most machmir shiur.Machine mtzah goes down much quicker than hand. I eat both.
Not to be misunderstood, I am against using stop watches, meausring apparati and the well known obsessiveness that goes with this mitzvah. What I do for myself is my own busines. I think that if one just eats matzah for a few minutes without worrying, the mitzvah has been performed more than adequately.