Tried to find this on CO's website, couldn't, and their phone won't let me through to a person right now:

Does anyone know what the earliest is before a flight I can check in luggage at SFO on CO? I have an interview much earlier in the day, and it looks like I'm going to be required to fly out on a 11PM red-eye. I'm hoping I can check my bags maybe around 5PM and then go out for a bit; is this possible?

Thanks!