Well I tend not to think of quiet hours on my main - the focus is MV time.

FA time for me was before 4pm GMT because that's when the 'I will win every FA' guy usually showed up - but he's gone now. In the OMA league I generally found that 11am to 2 or 3 pm was a good time for me to buy.

If you have the time, load your favourites with attractive players and observe.