Unless there is some contractual or union prohibition, I see no problem with the employer having you multi-task during your day. If you are working more than 40 hours per week you should get overtime.
The above answer, and any follow up comments or emails is for informational purposes only and not meant as legal advice.
You should be getting overtime for all work over 40 in a week. If you are working on a prevailing wage job you should get overtime after 8 hours of work in any day.
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