Length of Domain Names
The maximum length of a domain name is 63 characters. Characters may be letters, digits or hyphens. The rule of 63 characters is defined at https://tools.ietf.org/html/rfc1035 The URL of a website can be longer than 63 characters, as you can work with subdomains and folders. Experts preferring a keyword loaded domain say, that you cannot avoid long domain names. Other experts stress, that a domain name should be short because of memorability.