Studies suggest that learners attention, after a 2-3 minute settling down period at the very start, can be held for about 15-20 minutes Johnstone and Percival studied students with 12 lecturers in over 90 lectures. They spent 2-3 mins settling down, 10-18 minutes first lapses in attention after 10-18 minutes, then progressively shorter attention periods, dropping to 3-4 minutes towards end.
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