4 Added in exact timing from Star-K article
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The Aruch Hashulchan at the end of Yorah Deah 116:3 writes (emphasis mine):

וכמה זמן ישהו שיהא מגולה ותיאסר? כדי שיצא הנחש מתחת אוזן הכלי ויחזור לחורו, והוא זמן מועט

And how much time can the drink be left uncovered until it becomes forbidden? Enough time for a snake to come out from under the handle of the vessel and return to its' hole, and that is a short time.

While still not giving an exact timeframe, the Aruch Hashulchan is at least clarifying that it's a relatively short amount of time.

In the most recent issue of Kashrus Kurrents published by the Star-K (Spring 2019) they have an article about various food-related dangers and the last issue they mention is uncovered drinks. According to the article (which quotes a work named שמירת הגוף ובנפש as the source):

The timeframe in which to forbid uncovered liquids is three seconds.

The Aruch Hashulchan at the end of Yorah Deah 116:3 writes (emphasis mine):

וכמה זמן ישהו שיהא מגולה ותיאסר? כדי שיצא הנחש מתחת אוזן הכלי ויחזור לחורו, והוא זמן מועט

And how much time can the drink be left uncovered until it becomes forbidden? Enough time for a snake to come out from under the handle of the vessel and return to its' hole, and that is a short time.

While still not giving an exact timeframe, the Aruch Hashulchan is at least clarifying that it's a relatively short amount of time.

The Aruch Hashulchan at the end of Yorah Deah 116:3 writes (emphasis mine):

וכמה זמן ישהו שיהא מגולה ותיאסר? כדי שיצא הנחש מתחת אוזן הכלי ויחזור לחורו, והוא זמן מועט

And how much time can the drink be left uncovered until it becomes forbidden? Enough time for a snake to come out from under the handle of the vessel and return to its' hole, and that is a short time.

While still not giving an exact timeframe, the Aruch Hashulchan is at least clarifying that it's a relatively short amount of time.

In the most recent issue of Kashrus Kurrents published by the Star-K (Spring 2019) they have an article about various food-related dangers and the last issue they mention is uncovered drinks. According to the article (which quotes a work named שמירת הגוף ובנפש as the source):

The timeframe in which to forbid uncovered liquids is three seconds.

3 Stressing the "short time" piece.
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The Aruch Hashulchan at the end of Yorah Deah 116:3 writes (emphasis mine):

וכמה זמן ישהו שיהא מגולה ותיאסר? כדי שיצא הנחש מתחת אוזן הכלי ויחזור לחורו, והוא זמן מועט

And how much time can the drink be left uncovered until it becomes forbidden? Enough time for a snake to come out from under the handle of the vessel and return to its' hole, and that is a short timethat is a short time.

While still not giving an exact timeframe, the Aruch Hashulchan is at least clarifying that it's a relatively short amount of time.

The Aruch Hashulchan at the end of Yorah Deah 116:3 writes:

וכמה זמן ישהו שיהא מגולה ותיאסר? כדי שיצא הנחש מתחת אוזן הכלי ויחזור לחורו, והוא זמן מועט

And how much time can the drink be left uncovered until it becomes forbidden? Enough time for a snake to come out from under the handle of the vessel and return to its' hole, and that is a short time.

The Aruch Hashulchan at the end of Yorah Deah 116:3 writes (emphasis mine):

וכמה זמן ישהו שיהא מגולה ותיאסר? כדי שיצא הנחש מתחת אוזן הכלי ויחזור לחורו, והוא זמן מועט

And how much time can the drink be left uncovered until it becomes forbidden? Enough time for a snake to come out from under the handle of the vessel and return to its' hole, and that is a short time.

While still not giving an exact timeframe, the Aruch Hashulchan is at least clarifying that it's a relatively short amount of time.

2 added 14 characters in body
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The Aruch Hashulchan at the end of Yorah Deah 116:3 writes:

וכמה זמן ישהו שיהא מגולה ותיאסר? כדי שיצא הנחש מתחת אוזן הכלי ויחזור לחורו, והוא זמן מועט

And how much time can the drink be left uncovered until it becomes forbidden? Enough time for a snake to come out from under the handle of the vessel and return to its' hole, and that is a short time.

The Aruch Hashulchan at the end of Yorah Deah 116:3 writes:

וכמה זמן ישהו שיהא מגולה ותיאסר? כדי שיצא הנחש מתחת אוזן הכלי ויחזור לחורו, והוא זמן מועט

And how much time can the drink be left uncovered until it becomes forbidden? Enough time for a snake to come out from under the vessel and return to its' hole, and that is a short time.

The Aruch Hashulchan at the end of Yorah Deah 116:3 writes:

וכמה זמן ישהו שיהא מגולה ותיאסר? כדי שיצא הנחש מתחת אוזן הכלי ויחזור לחורו, והוא זמן מועט

And how much time can the drink be left uncovered until it becomes forbidden? Enough time for a snake to come out from under the handle of the vessel and return to its' hole, and that is a short time.

1
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