How many systems do you have?

Had 3, but down to 2; I sold off my headphone system due to lack of use.

Four.

Main one in the living room, smaller one in the dining room, former main components in the bedroom and one in my office. All that in a townhouse of less than 1,000 sq ft :-)

Two is a bare minimum.  One is the main system, the other is made up of hand-me-downs from the main system, so you get more mileage out of replaced components before they leave the premises.

In short time, when I take delivery of my new amp I will almost have two systems.....   I have doubles (or more) of everything to build a second system,  except speakers.     So basically I'm now on the lookout for speakers 

I have enough audio equipment to have 7 complete systems....that's speakers, receiver or integrated amp,pre amps,Solid State or Tube (pre amps, receiver ,amps or integrated amp) cassette decks,and or cd players ,plus Speakers ,with rear speakers also....I'm like Crazy Eddie's, I'm Insane....