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In order to recite an after-beracha —- take bread, for example —- must the full kazayit be eaten right after making the opening-beracha, or could one taste the bread and wait a period of time before eating the shiur kazayit (or two) in one sitting?

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The STAR-K writes

Although ideally a kezayis should be consumed immediately, it is also acceptable for one to initially eat a small amount of bread after the brocha and then eat a kezayis of bread within a two, or at least four minute span later in the meal.

  • Do they explain why there is any preference? – Double AA May 5 '20 at 17:32
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    @DoubleAA They don't seem to offer an explanation for the preference - perhaps it's a concern one won't eat a kezayis within the time frame, but I wouldn't speculate that without knowing poskim mention such a reason – NJM May 5 '20 at 18:31
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    Then this may only apply on Shabbat and not be a general rule about blessings – Double AA May 5 '20 at 23:22
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Halachipedia says

One is only obligated to make a Bracha Achrona on a food if one eats a Kezayit of food in Kedi Achilat Pras.

How long is Kedi Achilat Pras?

Shiurei Torah (Rav Chaim Noeh 3:15 pg 203) writes that Kedi Achilat Pras is 4 minutes.

Vezot HaBracha (pg 6) writes that many poskim (and quotes Rav Elyashiv as one of them) agree. See Aruch HaShulchan 202:8 and Kaf HaChaim 210:8.

Rav Ovadyah Yosef (Sh"t Yachave Daat 1:17) rules that Kedi Achilat Pras preferably is 4 minutes and after the fact (Bedieved) it is 7.5 minutes.

Or Letzion (vol 2, 14:17) holds that Kedi Achilat Pras preferably is 4 minutes and after the fact (Bedieved) it is 6 minutes.

So, ideally you have 4 minutes.

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    I think you may have misunderstood the question – Double AA May 5 '20 at 17:33

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