How to handle Temporay Network Accounts

Hi, I hope I am in the correct spot to post this question. I work for a company that has temporary workers coming and going at an astonishing rate. We set up network accounts like temp1, temp2, temp3 … all the way up to temp50. We would give the account an expiration of 2 weeks on these accounts, because these accounts would not be used and the manager of the department using these accounts when never tell us to disable the accounts. We felt this was a big security risk. Then it got to be a big hassle to reset the accounts because there are so many of them. So my question is … how do other companies handle temporary employees.