I once heard one drunk attorney bragging to another in an Airport Hotel how he was billing 20 hrs a day, and still had time for Golf before heading home.
It can be done with ease. Let’s say I go to court for motions, and I spend 2 hours there. If I had 5 files with me, then I just billed 10 hours, not 2, all before lunch! It might not be honest or ethical, but it can be done, and is done. Often. It’s a disgusting business.