New subchannels not appearing in guide

Hi all, how long does it take for newly added subchannels to appear in my Roamio guide? Specifically I'm referring to GetTV on KOIN channel 6.2 and Decades on KOIN channel 6.3 in Portland. These channels have been active for a few weeks and don't appear in my guide. I did a new scan, and they scan as expected but no guide data.

Thanks for any pointers,
Alan Rovner
Vancouver, Wash.