The Federal Communications Commission has halted its review of Comcast’s proposed $45 billion merger with Time Warner Cable, extending the second wave of the public comment period from the original Oct. 8 deadline to Oct. 29. But that’s not why the FCC reset the clock.

In a letter to company leaders, the FCC wrote that both companies' responses, which were submitted more than a week late, were incomplete and failed to fulfill the commission’s earlier request for specific information. For example, the Comcast cited its merger with NBCUniversal as an example of a large-scale media acquisition that did not lead to higher prices for networks and TV stations. However, the FCC found the exact opposite in its own analysis and demanded an independent review and explanation.

What's the other reason that the FCC paused its review? Comcast’s and Time Warner Cable’s counter-arguments were really, really long — 800 pages — and will no doubt take some time for the commission to rake through.