Term: Adventuring Day

A standard day within an Adventure. Often comes in the form of 24 hours, and is used for exploration and the limitations of how resources can be spent (namely, anything that relies on Long Rests.

For the record, you can have up to two Long Rests per day using normal rules, and half a long rest per day with the Prolonged Resting Optional Rule (it taking 2 days to perform a long rest).