When using dictation on OS X 10.8, if I speak for too long (approx 20 seconds+), the dictation times out and switches off. Worse, it loses (i.e. doesn't "type") all the things I've said so far. This is obviously irritating - I have to judge when to stop speaking, hit "Fn", let dictation type the text, and start again.
Is there a way to increase or turn off this timeout?