Translation:He wants the book at 3:00 pm.
In some of my other learning materials it says to use:
kakahiaka from 6-10 am
awakea from 10 am-2 pm
ʻauinalā from 2-6 pm
ahiahi from 6-10pm, and
pō from 10 pm-6 am.
I have the feeling that Hawaiians don't apply the times so exactly, but that the lesson was trying to give estimated times to help the student understand. I found a lesson online that I think probably gives definitions that Hawaiians might be more likely to use. I've rearranged what it says here, but I link the full lesson after:
kakahiaka - morning; from when it’s light enough in the early morning to see where you are going without an artificial light and it’s time to get going for the day.
awakea - midday; when the sun is over and above your shoulders and head and you feel perhaps it’s time to get out of the hot sun for a rest and something to eat.
ʻauinalā - afternoon; when the sun is visibly making its curving descent towards the western horizon; after a rest, time to think about wrapping up the day.
ahiahi - evening; late in the day, when you start to notice the dimming of daylight and feel like it’s time to stop work and go back home.
pō - night; when it’s dark enough to see stars in the sky, all the way through the turning of the Milky Way and until light breaks the horizon line.
To see that full lesson, check out https://oleloonline.com/0514g-introduction-to-time-and-telling-time-on-the-hour/