Today I did some research about Title attribute for AD user object.
As some job titles are pretty long it was not possible to enter full job title in Active Directory Users and Computers console, it is possible to enter only 64 characters.
As it turns out this is a limitation of Active Directory Users and Computers console. If we connect to Active Directory Schema through ADSI Edit, we can see that maximum limit is 128 characters. We can use attribute editor or script to enter up to 128 characters.
If this is still not enough, it is possible to increase rangeUpper value.