[Retric]

* (5mins/attendance * 6 classes * 10 mins bathroom break form filling/a day * 2000 students * 34 weeks/year / 60mins/hour = 340K)

  Mistakes:
  Actual school days in 34 weeks = 5 * 34 days
  5min / day * 10 minutes bathroom break = 50minutes 
  Bathroom break form does not take 10 munutes per class.

More reasonable calculation 6 class * (( 5 min / day * 34weeks * 5days / week) + 3 * 10 min) * 2000 students / (60 min / hour) = 176K hours.

PS: Checking attendance takes less than 5 minutes, but adding in the time it takes them to fill out a form and I am willing to say 5 minutes lost to that type of activity.