Employment Offer Letter Instructions. In your acceptance letter, thank the hiring manager for the offer to work with the company.Indicate that you are happy to accept the terms of employment. Offer letters must be prepared to preserve at-will employment status unless the employer consciously decides otherwise. See Preserving At-Will Status. It depends on how easy it is for them to fill the position and the temperament of the admin. However, it's closer, in a better district, and pays more. Accept offers in good faith. Customarily, in the US, it is three days. If you accept this offer, you will need to complete tax and other employment forms (in person) to be placed on payroll on or before your first day of work.