This varies depending on the company's human resources policies. This information may not be made available to you prior to the issuance of an offer letter. However, generally there is a fixed number of vacation days (or hours) depending on your level at the company (generally increases on an annual basis as you move up in the company. In recent years, a lot of companies have adopted an "unlimited sick days" policy. A lot of people tend to abuse this policy and use a "sick day" in place if vacation as to not decrease their available vacation balance. Be aware and be careful as the company can track sick day usage and may ask questions if they are led to believe someone is abusing the policy. Hope this helps!