How do I make my digital canon camera record for 24 hours?

Need the model to be more specific, but in general you need to keep the shutter open for 24 hours.

OK, for one, it depends on which camera you have.

Are you talking about video or still? Because if you’re talking video, you can’t, (ok, I shouldn’t say can’t, but if it’s a “camera” and not a “camcorder”, you can’t and it would be a push, if not impossible, even then! )

That said, if you want to take a long exposure, and have a camera capable of it, you might be able to use the bulb setting. It keeps your lens open until you release it.

Although Mike has the right answer, his link is spam, don’t bother clicking it!

But do re-edit, and tell us what camera you are using.