I hope that hour hasn’t passed …
Really, I think the difference is negligible. There may be a small amount of extra time taken to compress the QT (if it’s not Animation codec) but in the case of the TGA sequence, you’ll have to also convert the TGA sequence to something God can take back to his laptop and play, yes? That would be an extra step.
(no disrespect meant)
The time is taken in the rendering of the frames before the conversion to the output format. So the best way to save time would be to render at half-res and half the frame rate in the Render Settings. It’ll mean you’re rendering fewer pixels and fewer frames. If you want to check, do a test, but that’s what my experience has shown.
Steve