This is copied from the WA ST DOL
Breaks
When must a worker get rest periods?
Workers must be allowed a paid rest break of at least 10 minutes for each 4 hours worked.
The rest break must be allowed no later than the end of the third hour of the shift.
Can workers take several "mini" breaks instead of a 10 minute rest break?
Yes. Businesses may allow workers to take several "mini" breaks in each 4 hours of working time. If these mini breaks total 10 minutes this substitutes for a scheduled rest break.
Examples of mini rest breaks are personal phone calls, eating a snack, personal conversations, smoke breaks, and whenever there is no work to do for a few minutes during a work shift.
Not sure what you perceive as incorrect regarding the original post. The PAID rest break must be taken no later than the END OF THE THIRD HOUR, which would be as in the OP; one 10 minute break after 3.5 hours worked.
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