My '02 F150 uses a qt every 1000-1200 miles.
I am currently at 26 months/5,000 miles on my current oil change (Pennzoil Platinum 0w-20 initial fill, various xw-20 oils for top off, running a Mobil 1 filter).
I am due to add a qt, but am debating changing the oil and filter instead.
I have some Pennzoil Platinum 0w-20 HM and an Fram Ultra I was thinking of using and not changing for a few years.
Depending on the vehicle, every 7,000 miles is a good interval