See that part where it says "except that this subdivision does not apply where the intermediate appellate court has (a) extended the time for argument or submission of the appeal..." ?
Courts postpone hearings and grant additional time for stuff a lot, and courts are particularly eager to give Trump far more leeway than anybody else.
From what I understand this kind of stuff is usually sentenced concurrently. Also, I would avoid any sentence that looks like it's calculated to just prevent him from campaigning. That's a political match you do not want to light. From that angle his sentence should either keep him in jail well past the election and swearing in or release him with a month or more to campaign. A 20 month sentence would be appropriate in the guidelines, and meet this political test. A sentence that sees him released very quickly or not get jail time at all after Cohen served time would be a miscarriage of justice.