I don’t know. That’s their business decision. The average company’s goal with severance pay is to offer just enough money to encourage you to sign it. Some may be more charitable;  it’s just about the dynamics and culture of the company and its management—and perhaps the financial health of the company at that time. Sometimes a client I am consulting with will tell me that ___ weeks or months is “the industry standard.” However, while there may be some trends, it all depends on the specific company you’re dealing with and their circumstances and culture.