When is your software project "done"?

Seems like a simple question, but the answer is not as clear as you may think.

Answers could include:

So stay agile -- release early and often.  A release is truly done.

However, the software itself will never be "done done".  Years (perhaps decades) after "completion" someone will find a bug, or need some critical feature, and you'll be back at it again.

Know this and accept it from the start.