This info is usually self-reported by the business. If they don't have someone assigned to the job of making sure Google is up to date with their hours, it ofte

This info is usually self-reported by the business. If they don't have someone assigned to the job of making sure Google is up to date with their hours, it often won't happen. My company (a small web host that works with mostly local businesses) has a Google specialist whose job is about 70% keeping our client's metadata up to date with Google.