How often does one have to ride a bike for it to be considered a bike that "you actually ride"?

I own 4 total.

1. a giant boulder. has been just sitting in the back yard for 3 years now. I hate to think about it's condition.
2. is my GT and it gets action about once every 3-4 months when my other 2 good bikes are both down.
3. is my trek belleville. Now mostly junk thanks to me installing a nuvinchi n360 hub that is so inefficient I can no longer pop the front wheel off the ground. Used only as backup for my next bike.
4. My daily commuter, a Giant freerider city bike. It is ridden about 5-6 days a week. About 100 miles on average.