In past Google’s Search results META Title length was 75 characters. But now the length increased to 80 characters and some times maximum supports to 86 characters.
Before Google’s search results page width was 520 px and Now the search results page width increased to 600 px. So, That’s why the title character lengths are changed.
So, The new META title length will be minimum and maximum is from 80 to 86 characters.
But the best optimization previous Title length is 55 characters. and now new best length is 60 characters.