Your opening hours decide which times customers can book. Davinote sets a sensible default for you the first time, so this screen is usually about adjusting rather than starting from nothing.
Open Opening hours
Profile, My business, My hours. All seven days show as cards, each with its hours or marked closed, and a vacation switch at the top.

Understand the default
If you never set hours, Davinote fills in Monday to Friday 08:00 to 17:00 with the weekend closed, and saves it for you without asking. Reopening the screen shows it still there.
Edit a day
Tapping a day opens its editor so you can set the opening and closing times.
Close a day
A closed day stays in the list marked as closed rather than disappearing, so you can reopen it later.
At least one day has to be open. Trying to save with all seven closed shows a validation message.
Copy one day onto another
Use the copy action on a day with hours and every other day becomes pasteable. Paste onto one and the copy mode switches itself off — one paste per copy.
Copying from a closed day does nothing, and pasting onto the day you copied from does nothing either.
Save
Changes are pending until you save. Leaving without saving asks you to confirm.
Use vacation mode to pause
The switch at the top makes your business inactive and hides it. Turning it off brings you back. It is the same switch as the one in Settings — they mirror each other.
If the change fails to save, the switch flips back to where it was and shows an error rather than pretending it worked.
