How long does it take for Kaiser to add you to your spouse's plan?

I'm planning to marry my fiance later this year, and wondered how long it'll be before I'm able to use Kaiser's facilities once we contact them to let them know? He's already registered, and gets Kaiser through his employer.How long does it take for Kaiser to add you to your spouse's plan?
It depends on how long it takes his employer to process the paperwork. Usually new spouses and newborns are added as soon as they are eligible, unless the employer requires you to wait until the open enrollment period for spouses.