If its an initial IR then it must all be completed withing the time validity of the Theoretical Knowledge Exams or you will have to retake them. For a Class or Type Rating:
The applicant shall pass the skill test within a period of 6 months after commencement of the class or type rating training course and within a period of 6 months preceding the application for the issue of the class or type rating.
I cannot find a specific limit for the IR Skill test except that the 1 year validity starts the day you passed the test and after 12 months it will have expired. You cannot renew a rating you have never held so it would be an initial test again. If the IR was part of a Class or Type rating you have blown it.