from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Lasting an hour: an hourlong television episode.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. which lasts an hour, or approximately so
- adj. of or relating to an hourlong period of time
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. lasting for an hour
hour + long (Wiktionary)