The livelong day old-fashioned humorous
This phrase means all day.
I've been sleeping all the livelong day.
Wearing this pair of high heels all the livelong day has made me uncomfortable.
Daughter: So I really want all my friends to have a great time. I was thinking it would be a good idea to have some candy out on the tables for people to snack on.
Mother: Well, if you want them to really enjoy themselves, candy is dandy but liquor is quicker.