They could have a char once a fortnight for a scrub-down and the heavy washing. The Combined Maze May Sinclair In an hour I had landed twelve trout and char, weighing 10Â½ lb. Sport in Vancouver and Newfoundland John Rogers In this light they were considered by the parliament in the 25 char.
The geologic time scale that represents the longest time span is  the eon. It is a unit of time that is equal to a billion years.
Period (geology) A geologic period is one of several subdivisions of geologic time enabling cross-referencing of rocks and geologic events from place to place. These periods form elements of a hierarchy of divisions into which geologists have split the Earth's history.