They consider full time employment at 30 or more hours per week.

If you have 100 full time employees hire 200 part time employees.

100 people will work 24 hours the other 100 will work 16 hours

The next week those that worked 16 hours the past week will work 24 hours this week. Those that worked 24 hours last week will work 16 this week.

Another idea

Divide you business into two separate ones. 24 hours at one operation 16 hours at the other one for the week.

Would work great if I had two fast food joints each under a separate corporation. Employees hire on to work at one 24 hours, work at the other 16 hours. Equal to a full 40 hours a week. They would get two separate payroll checks for the week.  If an employee does not like that they have a choice of a 16 or 24 hour work week.

Laws have consequences.