I can't remember from top of my head but from description:
The Delayed Start and Auto Keep Warm
The delayed start program allows you to set the eight in one to cook up to 15 hours in advance, so that your meal is always ready when you are - for preparing that early morning porridge before you head off to bed. What’s more, Its automatic keep warm feature ensures your meal is kept at an ideal temperature for up to 24 hours.
It doesn't work on all the programs but I can't remember which. Definitely works on slow cooking though. Just make sure that you can live with the capacity as it's on the small side but for 2 people it's been fine for us.