well-timed

Bieber's subsequent rise to the top of the teen-idol heap was as methodical as it was well-timed.

As I put this well-timed challenge into my pocket, I walked down the side, got into my boat, and put off.

How often have the asperities incident to conversation been instantly softened down by the means of a well-timed pun?

I think it well-timed and a good thought; and as you know I wouldn't say so to anybody else, I don't mind saying freely thus much.

A well-timed burst of anger sometimes removes responsibility, and sometimes shifts it on to other shoulders.

This prompt and well-timed measure produced the desired effect.