I can't find a good actual link to the entire data set with but looking at the data in the US Bureau of Labor Statistics' website you can see both the average n

I can't find a good actual link to the entire data set with but looking at the data in the US Bureau of Labor Statistics' website you can see both the average number of hours worked are trending downwards, having not been above the 35 hour threshold for a full time job since the 1980's. I have not found reputable data that differentiates full time employed into "One full-time job" vs. "Multiple part time jobs". Chart: https://i.imgur.com/Ah5YKd0.jpg https://i.imgur.com/Ah5YKd0.jpg