Apparently a lot of what people enjoy about holidays is not so much the holiday itself, but the anticipation of it. So how long in advance should you plan your holidays to maximise that enjoyment from anticipation? They need to be close enough to the present that they feel real and imminent, but far enough away that they don't just pop up immediately. They also need to be long enough to feel like a real holiday, but short enough not to eat up all your leave time. Tricky balancing act.
Mokalus of Borg
PS - Personally, I like taking some time late in the year.
PPS - Because all our public holidays are in the first six months.