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The Chamudei Daniel has the famous opinion that for things that the Shulchan Aruch says "it becomes not kosher immediately", that means "if you don't pull them out immediately." More like a 2-second rule or so.
The Geonim mostly lived in the Middle East, while the Rishonim mostly lived in Europe. So it seems likely that their opinions reflect different local customs. If your local custom is stricter than the established halacha, you can keep it while still recognizing the intellectual authority of those whose halachic ruling is more lenient.
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