There is no set period of time mandated by law. Obviously large schools must "retire" their older records eventually. If you need to know, call the school you are interested in and ask.
How long to keep accounting records for business in the US
They have to keep records for 6 years after your last appointment
Many people would keep a deceased person's records for at least 10 years. Many people keep these records for longer than that.
We must keep tax records for 10 years for a business
employer keep payroll records maxium 1 year .
You should keep the records for a minimum of 5 years.
as long as you want 2 i guess!!!
5 years
At least as long as the IRS requires records of transactions, 7+ years
A small business should keep tax records for at least seven years.
Seven years is standard.
five years