Steps to Change your Business hours on Google Business Profile
Sign in to your Google My Business Account
To Change the Business Hours First Sign in to your GMB Account.
Click on “Edit Profile” in your GMB Account
Once you Signed in to your Account, You can see your Business on Google. Then Click on “Edit Profile”
Go to the “Hours” Section in your Business Information
Once you Get into your Profile, You can see the Business Information which is About, Contact, Location & Hours.
Change the Opening Hours & Special Hours
In Hours Section You can Change the Opening Hours, as well as you can add Special hours.
Once you Changed it, Your new business hours will be updated on Google Maps and other Google services within 24 hours.