(all) through (e.g. the night); throughout (e.g. the year); all ... long
within (e.g. the week); in the course of (e.g. today); by the end of
all over; throughout (e.g. the world)
all (of a group); the whole (family, school, etc.)
「中」 has other readings with different meanings.
一日中パソコンの前に座っていた。
I sat in front of the computer all day.
世界中から来ました。
They came from all over the world.
世界中の人に伝えたい。
I want to tell people all over the world.