change filter cycle to every 24 hours from 12 hours

[supernasen]

Hello, I recently bought a used Coleman 508 spa. I think it's the 2002 model year. This model has a 12 hour filter cycle. I find this really inconvenient, since the tub is close to my house and the noise is distracting. I would prefer to instead run it on a 24 hour cycle where it turns on just once per day. That way I could run it in the late morning or early afternoon when it doesn't bother anybody. 

I'm wondering if there's a way to change a jumper on the circuit board or otherwise modify the tub to run on a 24 hour cycle instead. Does anybody know?

Thank you!