Every 5 minutes lost costs you 50 cents per person.  10 workers, taking 5 minutes extra, spread across 2 breaks and lunch costs you 10 x .50 = $5.00 per day.  Times 250 work days.  $1,250.00 each year (at the minimum).  A one-time investment recovers that 5 (to 20) minutes lost per day.  How might that affect your profits?