Schools around here – and probably elsewhere – build a certain number of days into the school year to accommodate potential cancellations for snow. Snow days. They're a gamble, really. If you build in too many days then you have "extra" time in the school year. But not enough and you pay for it later.
We are very close to adopting this method of planning for our morning, before school/work routine.
To accommodate time-outs.
So funny!