The threshold is 30 hours on average in a given month [0]. So, presumably, if you work 31 hours one week they'd make you work 28 the next to avoid you being labeled full-time.

[0] https://www.irs.gov/affordable-care-act/employers/identifyin...

In many of those cases they don't officially record it and it's called "wage theft."

Full-time is determined by whether or not someone works 'an average' of 30 hours a week. To qualify as a full-time worker, you have to work 130 hours a month. So your employer would just cut back your scheduled hours the next week to stay under 130 hours.

And employment contracts for hourly works are incredibly rare and pretty much nonexistent for part-time workers.

Unfortunately, in most areas, low-wage workers get no contract whatsoever: YOu can pretty much be fired at any time for almost any reason except for a few federally protected ones. Those are easy to work around.

I'm not sure if going over one month does anything, and it most certainly doesn't do anything in a week: Some places will schedule folks around 40 hours for a couple weeks and then nearly nothing for a week to get the average down.

Failure to clock in and out properly can result in termination.

The manager gets a stern talking to. Really.

I have worked retail, and almost been physically pushed out the door at the point that my manager was risking a subordinate going over X hours. They are held accountable for it.