I think the layover can be up to 18 hours:
If your trip includes more than one flight on Alaska Airlines and/or one of our airline partners, we will check your bags to the final destination on your ticket as long as there are fewer than 18 hours between flights.
https://www.alaskaair.com/content/tr...ween%20flights.

The scheduled arrival time of my AS flight to SFO is 11:35am and my departure on StarLux is 11:40 pm - 12 hours and FIVE MINUTES of connection time. Would they be a stickler about that if 12 hours was the limit?