What business category are you seeing this in? Keep in mind that service area businesses, especially when they have an after hours answering service are totally fine to list as 24 hours.
I've also never really seen Google take action on reporting a business's hours before in general, especially when they have a after hours answering service.
I'd also be careful when using suggest an edit to modify a business's hours if you aren't sure what they are supposed to be. Those types of edits, especially if Google rejects them multiple times can lead to your account getting flagged.