Site url exceeds maximum length of 256

I'm trying to create a team site and get the following error message

Site url https://myurl/sites/mylongsitename exceeds maximum length of 256.

The url itself is under the 256 limit, I've also tried appending "Shared Documents" and "Shared%20Documents" and its still under the limit. Does anything else get appended to increase the length.

Is there a way for me to validate this before attempting to create it?

This is the code I am using source

 using (ClientContext tenantContext = new ClientContext("http://ift.tt/1Gjt63X"))
        {
            //Authenticate with a Tenant Administrator
            SecureString passWord = new SecureString();
            foreach (char c in "password".ToCharArray()) passWord.AppendChar(c);
            tenantContext.Credentials = new SharePointOnlineCredentials("admin@yoursite.onmicrosoft.com", passWord);

            var tenant = new Tenant(tenantContext);

            //Properties of the New SiteCollection
            var siteCreationProperties = new SiteCreationProperties();

            //New SiteCollection Url
            siteCreationProperties.Url = "http://ift.tt/1Gjt8J8";

            //Title of the Root Site
            siteCreationProperties.Title = "Site Created from Code";

            //Email of Owner
            siteCreationProperties.Owner = "admin@yoursite.onmicrosoft.com";

            //Template of the Root Site. Using Team Site for now.
            siteCreationProperties.Template = "STS#0";

            //Storage Limit in MB
            siteCreationProperties.StorageMaximumLevel = 100;

            //UserCode Resource Points Allowed
            siteCreationProperties.UserCodeMaximumLevel = 50;

            //Create the SiteCollection
            SpoOperation spo = tenant.CreateSite(siteCreationProperties);

            tenantContext.Load(tenant);

            //We will need the IsComplete property to check if the provisioning of the Site Collection is complete.
            tenantContext.Load(spo, i => i.IsComplete);

            tenantContext.ExecuteQuery();

            //Check if provisioning of the SiteCollection is complete.
            while (!spo.IsComplete)
            {
                //Wait for 30 seconds and then try again
                System.Threading.Thread.Sleep(30000);
                spo.RefreshLoad();
                tenantContext.ExecuteQuery();
            }

            Console.WriteLine("SiteCollection Created.");

        }

The total length of the url is 148