Since I’ve been Northwest Platinum, every single upgrade has cleared at the six day upgrade window. Wait, I take that back, every upgrade has cleared by the six day upgrade window at the latest, many even seven days out. Now, in all fairness that has only been about a dozen flights, but half of them have been on “busy” days of the week.
Compare that to United, where as a 1K with nearly 200 segments this year I don’t think I’ve had a dozen upgrades clear at my 100 hour window. All but one eventually cleared, but mostly within a day of the flight.
Interesting, isn’t it?