Yuppers.
That would be 2 pay periods. More than enough time to report the shortage and then file the grievance when the error was not reconciled.
As I said, you are entitled to the 4 hours, but not the penalty pay as you failed to file in s timely manner.
Have you ever filed a grievance Dave?
The "occurrence" happened September 9th when he did not receive his full pay.
That would give him until the 19th to inform management of the "occurrence".
He said he talked to 2 sups who said they would make sure he got paid.
It is very likely he spoke to them before the 19th.
He also spoke to a steward, perhaps before the 19th.
It sounds like he was missing pay on the 9th, informed management and steward the following week (11th to 17th).
After reassuring him he would be paid his hours, they failed to cut a green check.
If this is the case, I would venture to say he satisfied the 10 day requirement by informing management by the 19th, but they failed to resolve it in a timely manner.
Their failure to adjust his pay for the 16th (or cut a green check) could be considered the "occurrence"
The OP should file ASAP, and ask for the penalty pay, along with wording that makes it clear this is ongoing.
Filing immediately would not hurt, and would only expedite the process.
If for example he was harassed one month ago and the harassment is ongoing, do you think he lost the right to file just because the first occurrence was a month ago? The shortage is ongoing. File.