It’s rarely two 9-5 M-F jobs that add up to 40 hours a week.
It’s usually a combination of a primary job that is just below the threshold of full time and therefore doesn’t qualify for basic benefits like health insurance, paid time off, or retirement <32 hours.
Usually the second job is in the evening and weekends. Service jobs, retail, etc. Often the schedule varies wildly and changes often.
Typically both jobs are paid hourly and can end at any time.
A lot of people work much more than 40 hours per week, but don’t have the security of a full time, salaried job.
In the same boat. FTD.