Interesting. I don’t fly any particular routes regularly though I’ve logged somewhere near 70k miles this year already, but I have not noted “hour-out” descents.
I have flown in and out of PDX, MSP and IAH nine times since mid-December. The last two trips, iyt seems that the engines are now cut back a bit 70-75 minutes out. I also take the same flights and while the departure times are the same, the arrival times are a bit later. Could be from cutting speeds and/or seasonal changes in the jet stream.