A student can work 475 hours of student jobs a year. After this you need to register him/her under another statute.
Only the student can see on Social Security how many hours he/she has worked. The government doesn't allow third parties to see this data.
Therefore we can only keep the days an employee is planned with Strobbo. So we cannot take into account if he/she has worked somewhere else.
You can check how many days an employee has worked with you by following these step:
Choose in the menu for Schedule - Logs.
On the right you can see how many days this person has worked for you.
On the left you can see the details of his/her employment.
Hint: you can also add days manually to correct the calculation. Click on the magnifying glass on the left and then on the red button at the bottom right.