All 80 because the overflow remainder are in various states of repair/restoration and stored offsite.
They have all been shopped out completely prior to bringing them onto the property so 95% of the subsequent unexpected breakdowns that go wrong can usually be repaired in under 30 minutes or worst case swap in a spare board on hand to get it up and running again straight away whilst you diagnose away from the home.
It's a simple rule that keeps the wife happy.