Title tag length 2014
If one is updating meta tile or creating new there are new pixel base calculation for meta title. Google have update the SERP result page css and look. Based on that Meta title should be up to 512 pixel wide.
55 character with space is will give you reasonable fit in SERP
Read more in details about meta title length at moz
Tools to test & generate is SEO Frog
Sweta Shah 