I've noticed that Christian funerals and burials tend to come several days after the death, even in cases where the death was expected, there was no police involvement (so no need to wait on investigations), and nobody had to travel great distances.1 I've seen this for Roman Catholic, Greek Orthodox, and some type of Lutheran (sorry, don't know which) so I'm assuming it's general, but if that assumption is mistaken please correct me.
Is there a theological reason to wait? Maybe a wait of three days is religiously significant, or there is some belief that either the soul or the family needs the delay? Is it a practical concern (that somehow doesn't apply to Jewish burials, which are usually within a day)? Is it not seen as urgent and so it's easier to just always have a delay?
1 The case that reminded me to ask the question is a Monday-morning death, expected, and a Saturday funeral, where nobody has to fly in.