[Rails Sys Admin] Curious.. how often do you deploy?

Nothing scientific here people, I was just curious how often you
deploy to production?

I am the sys admin of a large rails site, and we seem to deploy every
day (providing that all tests pass).
However, in my previous experience we had a deploy schedule (Tuesday
and Friday not including emergency deploys).

So... The questions is: how often do you deploy?


We have 2 weekly iterations, with out of iteration deployments only in
case of emergency, and (to the extent that these things are possible,
and barring emergencies) we usually agree the contents of the
iteration before it starts (i.e. we don't chuck random things in half
way through).