The length you need in database to store URL should be 2083. This is because popular browser Internet Explorer only accepts 2083 characters. The question is, if you do not want this length or you want a shortened for some reason however, what is the best length?
The answer might be 255. OpenID indeed is a URL. According to OpenId 1.1 Appendix D: Limits, the maximum limit for Identifier Urls is 255 bytes.
http://support.microsoft.com/kb/208427
http://openid.net/specs/openid-authentication-1_1.html#limits
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