An employer cannot force an employee to work. Conceivably, if the 30 day notice period is part of a contract, the employer can claim breach of contract.In my experience HR can take any time from a week up to a month to respond with a letter and formal offer or acceptance. Give Adequate Notice. A customary notice period is about two weeks, unless you have a non-compete contract or a similar arrangement with your employer. It's pretty standard to give your employer at least two weeks notice when you quit. It will take at least 35 business days between when you first create a username and password and when you can file a return for the first time. If you are planning to make an offer in Philadelphia, we've compiled a stepbystep guide so you know what to expect. Log in to your account. Once you've received your letter in the mail, return to the Philadelphia Tax Center's homepage.