English version

attention span

From Longman Dictionary of Contemporary Englishattention spanatˈtention ˌspan noun [countable usually singular]  the period of time during which you continue to be interested in something Children often have a short attention span.
Examples from the Corpus
attention spanMost puppies have a rather limited attention span, such is their enthusiasm for life.Dear Kidsday: My attention span in school is very, very short.Kids his age typically have a very short attention span.Try to increase your attention span and extend the length of time over which you can work effectively.short attention spanRamanujan has a short attention span and will fly off on a new tangent every time he sees a new idea.A busy man, Johnny Cash, with a notoriously short attention span.
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