I'd replace it today. Take the media from the broken one and add it to the new one. If you can't do that today, then feed very lightly while doing water changes to keep toxic levels down. I'd take the media and keep it wet by immersing it in the tank in some way. Specifics of how to go about this depends on the filter and media.
What type of filter and how many and what type of fish do you have?
What type of filter and how many and what type of fish do you have?