The day's extent is that we're going to do this, this, and this. That is our schedule or itinerary, so stick to it.

日程 is a relatively formal word used to talk about the schedule for a specific event, meeting, or activity.

This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.