As you may know with a student permesso you are allowed to work, but you have some limitations, in fact you can work only 20 hours per week, and maximum 1040 hours per year (art. 14, comma 4, DPR 394/99).
So if I work just for a certain period without overcoming the 1040 hours per year, can I work more than 20 hours per week?
No, In any case this limit cannot be overcome
My employer fortunately said to me that during the summer break from the lessons I can work full time, is it true?
No, the INL (Ispettorato Nazionale del Lavoro) released a statement explaining that in any case the main focus of a student having the student permesso is to attend his course of study, so he can never overcome the 20 hours per week. Nota 1074 del 24 maggio 2022 INL
What do I risk if I overcome the limit of working hours?
You and your employer can receive a very expensive fine, and you may have problems renewing your permesso di soggiorno
So there is no way to work more hours?
In this case you have to convert your permesso di soggiorno into the work one, with the nulla osta process
What about the internship? My employer wants to hire me with an internship contract, can I do it with my student permesso?
Yes, with the student permesso you are allowed to do an internship, also after the end of your course, that means that if you are doing an extra curricular internship and you finished your course, you can renew the permit on the basis of the internship
My employer said I cannot do a full time internship, since there is the limitation of hours for the student permesso, is it true?
No, by law, the internship is not recognized as a job, so there are no hour limitations for any internship
How can I convince my employer about it?
The INL (Ispettorato Nazionale del lavoro) released a statement explaining it. Nota 14 Febbraio 2023
Can I also convert my student permesso to the work one with the nulla osta if I have an internship contract?
No, as I said the internship is not recognized as a job, so it will not help you to get a work permesso.