Since when have full time salaried jobs been a mandatory 45+ hours per week in the US

So I'm just curious since it seems that basically every full time salaried job is 45+ hours. Like I don't get it. For the longest time it was 40 hours with some exceptions but now none of them do.

usa jobs
usa jobs resume
usa hotel jobs
usajobs
usa jobs federal government
usa job in ksa
usa jobs
usa jobs login
usa jobs gov
usajobs.gov
www.usajobs.gov
usajobs.com
usajobs
usajobs.gov official