| Answer | Crossword Clue |
|---|---|
| DAY | Twelve-hour period |
| STINT | Twelve-hour shift, e.g. |
| YEAR | Twelve-month period |
| DAY | 24-hour period |
| DIEL | Of a 24-hour period |
| TIMESPAN | One-hour period, e.g. |
| SOLARDAY | 24-hour period, in astronomy |
| DIEL | Involving a 24-hour period, in biology |
