From Australian sf information
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People running programme items are not expected to look after the children in the room, merely provide an activity to distract them. In general, programme items should run for about half an hour only (some high interest items, like Plush Toy Wars, may run for an hour). Over an Easter convention, programming will begin on Friday morning. It will run from the opening of programming each day until the dinner break, with a break at lunchtime. On Friday, items are best scheduled for half an hour out of every hour (based on the number of attendees), and Sunday, programming does not really need to begin before lunchtime.