For all of the experts out there in FlyerTalk land:

I have a trip coming up that is unique for me in terms of multiple segments and I had a question about the check-in process.

My trip is PHL-SFO-HNL. However, the PHL-SFO and SFO-HNL are split by an overnight. This is all under one confirmation number.

When I check in for PHL-SFO, will it allow me to check in the SFO-HNL as well or do I need to wait until literally 24 hours prior?

Thanks for any insight!