[dey-lawng, -long]
during the entire day; lasting all day: a daylong trip.

1850–55; day + long1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
daylong (ˈdeɪˌlɒŋ)
adj, —adv
lasting the entire day; all day

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The names refer to the daylong drive time needed to round each loop.
Instead, officials gather for a daylong conference and discuss how to react to various events presented in a fictional scenario.
Regarding the substructure performance, the column stresses did not exceed reasonable design limits during the daylong launches.
One hundred and ten human service professionals, officeholders and citizens attended the daylong symposium.
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