What we have today on the big 4 networks (excluding Fox), is what has been become known as "The Golden Hour". 10pm EDT, 7pm PDT. As such, the conventions schedule their big events in this window. If they go over, so be it...most will stay with overages. This actually has been going on for many convention cycles but it it now definitely the standard. Junkies know to turn to CNN/FOX for wall to wall, but even they edit as they please. True, CSPAN is the only true wall to wall, but lacks much commentary. Some would say that is a good thing.
Except Fox? Wait some Fox Affiliates and or O&O's will cover the convention under their local news label like KTVU. In the Case of KTVU Fox 2 San Francisco and KTVU+ aka KICU the other Fox station in the Bay Area. They air the convention from the RNC Directly and they use Fox News Feed but redubbed with local News staff narrating the events and bringing their experts in under the KTVU Fox 2 News at 7 banner. I expect Fox 2 in the Bay Area to do the same thing with the DNC convention.