Daylong (adjective)

Lasting or continuing throughout the day.

Origin:

Formed from the noun day and the adjective long.

Examples:

1. The daylong hike was tiring but exhilarating.
2. The daylong festival was filled with music, food, and joy.
3. The daylong conference was both informative and boring.
4. She spent the daylong reading a book in the park.
5. The daylong celebration was marked by parades and fireworks.