attention span

noun
the interval during which an individual can concentrate, as on a single object, idea, or activity.

Origin:
1930–35

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To attention span
Example sentences
Either technology had to improve or my attention span had to improve.
But the world has a short attention span, whereas the half-lives of many
  radioactive isotopes are long indeed.
We have a limited attention span, and our cognitive load is usually exceeded in
  every lecture or talk.
He was amazed, after starting medication, how his attention span had increased.
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