Is it 32 bit, or 64 bit or 128 bit or bigger?
['https://Stackoverflow.com/questions/861911', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/106866/']
I would go with 88 bytes. If you look at the ASP.NET state database, that is how it is defined.
Because it's generated as a [System.Guid](http://msdn.microsoft.com/en-us/library/system.guid(VS.90).aspx) Valuetype, it's a 128-bit integer, which is 16 bytes.