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" If he has 15 minutes between plays , he thinks it 's a vacation , " Seawell said . There is a Tiger Transit shuttle bus that runs every 15 minutes between 7:00 am and 6:00 pm weekdays . The testimony will be scheduled with 15 minutes between testimony for committee discussion . " But in a store , there may be only minutes between each use . Period were strictly adhered to , there would be no classes starting and ending with fewer than 15 minutes between them on either of the Twin Cities campuses , but SCEP also recognizes that class schedules are not always as neat and orderly as might be wished for in an ideal world . The mice without neurotransmitter receptors at this juncture " learned normally when trained slowly with hours or days between trials , but showed learning deficits when challenged to learn the same tasks quickly , with only minutes between trials , " McHugh said . Hands were washed without scrubbing 10 times between morning and evening , with a minimum of 15 minutes between washes .