Definition of "day-long" []

• Lasting all day.

The Century Dictionary (Public Domain)

• "In recent years an annual lock-in—a sleepover in the church—for youth has been canceled due to lack of interest, and when the clergy arranged for the parish to host a day-long antiracism conference taught by the diocese, only eight parishioners signed up."
• "In addition to the dozen who helped design the questionnaire, sixteen experts devoted several days to reading an initial draft of this book and discussing it in a day-long seminar in Cambridge in January 2010."
• "The day-long conversation touched on the practical and the philosophical with a few ideas taking hold in the stairwell during coffee breaks and crowding the twitter hashtag #activatenyc."