I had to ask the local tv station engineers several years ago to up the data amount. I had moved my mother closer and she didn’t want any pay tv, so at the time I gave her one of my Pal dvrs, which were using psip. There was only 12 hrs of data from the locals at that time. All but the local Cox stations responded and were happy to help once they knew some viewers were using the data.
They said they just had a couple of test tvs that only showed 12-18hrs of data, that they used to verify things were working. I emailed back and forth with them as they made changes and I reloaded data on my DTV Pal dvrs until they were satisfied things were working and there were no problems with the extended data.
I actually connected one of my Pals back up a few days ago, as I’m giving it to some friends to use. I don’t remember how much but it went out several days on the scripps, griffin and Sinclair stations.
The Pal dvrs are all I have left that uses the psip data. All my others use some type of online service. I put my HD Homerun back in service, but it pulls data thru Plex now and of course my TiVo’s get data from TiVo. My LG tvs pull data from online sources too.