Many electric pressure cookers, such as my Power Pressure Cooker XL come with delay time feature. According to the manual this can delay cooking by up to 24 hrs. Apparently to accommodate user's schedule. But wouldn't the ingredients spoil by that time? Has anyone used this feature? Am I not getting it right? 
I can give you a couple of delay timer use cases.  I use it A LOT!  The main way I use it is to set-up my oatmeal in a bowl ahead of time (using this technique) so it will cook while I sleep and be ready to eat when I wake up. Some also drop tea bags in the steaming water to make tea at the same time - I've tried it out of curiosity it doesn't taste that great (the tea).  Once a week I use it is to set-up a veggie dinner to be ready when I come home late from bringing my kids to after-school activities.  We could be walking in the door at 8:30pm and it's a life-saver to throw some bowls on the table and serve dinner shortly after walking in the door.  The recipes have to be all vegetarian as meat cannot sit in the pressure cooker waiting to cook (even frozen meat). Here are some of my family favorites to have ready for when we just walk in the door   Chickpea Curry & Brown Rice One Pot Butternut Squash Soup (with garlic bread I've prepared ahead of time) Split Pea & Bacon Soup (this is OK because it is cured meat) Sweet Potatoes & Black-eyed Peas One Pot   I hope that these ideas can spur more ideas on how to use the timer.  There are probably more ways but these are the two main ways I use the delay timer on an electric pressure cooker! 