Just to throw out another data point / opinion.
If possible, try to start the car AND let it fully warm up at least weekly.
DRIVE the car at least once each month, Ideally every other week. Get it warmed up, USE the brakes to get the rust off of the rotors, etc. etc.
You can get away with less, but cars generally stay a lot happier when they are regularly driven. Taking it out for a drive will keep the battery charged, keep all the oil seals properly lubricated, and just a world of other things that we don't think about.