from the Bureau of Labor Statistics
Civilian workers spent an average of 4.25 hours of the workday standing in 2020. Workers stood for 57.3 percent of the workday and sat for the remaining 42.7 percent. Workers in food preparation and serving related occupations spent 97.6 percent of the workday standing to perform job tasks, while workers in computer and mathematical occupations spent 87.1 percent of the workday sitting.
Workers in production occupations spent an average of 6.77 hours each workday standing and 1.45 hours sitting. Workers in computer and mathematical occupations, in contrast, spent 6.91 hours sitting and 1.02 hours standing.
These data are from the Occupational Requirements Survey. We also have more information on job requirements for sitting and standing. You can download the complete dataset or get the data through the BLS database.
Source
https://www.bls.gov/opub/ted/2021/civilian-workers-spent-an-average-of-57-3-percent-of-the-workday-standing-in-2020.htm