Maybe typically 5 of them have had a job before in the area, 3 have had a job elsewhere and 2 have never had a job. Not all of them have the same level of education.
How many will misunderstand your sign? Might any of those misunderstandings about money cause problems for people?
Considering the comparitive cost of writing the sign as "every two weeks", and the reduction in potential confusion, it seems like a no-brainer to write it that way.
By assuming a high-education environment you might nudge down the number of misunderstandings. You'll nudge it further if you assume English is everyone's first language. [Note that these assumptions are probably discriminatory]
You'll nudge it further if you assume that nobody in your working environment is dylsexic, or has any other linguistic impairment. [This assumption is certainly discriminatory]
You'll nudge it further if you assume that everyone is operating at 100% all the time... which is just plain untrue, as nicely summed up by this slide from Microsoft's Inclusive Design reference: https://marcysutton.github.io/mobile-a11y/img/injury.png
While you might be insulted by language that insufficiently feeds your desire to feel good about your intelligence, your right to not be insulted is a lower priority than communicating important information clearly.
If something is supposed to occur every other Friday? Write it just like that, or "every 14 days". Don't say, "Paychecks are distributed bi-weekly"