NHS Tier 2 retirement due to ill health

JTJD

Hi 
Can anyone explain what the term “like duration” means in the following: 

“If you are assessed as being permanently incapable of carrying out the duties of both your own job and also any other regular employment of like duration to your NHS job, you will be entitled to the retirement benefits you have earned to date plus an enhancement, known as a Tier 2 pension. A Tier 2 pension is made up of a Tier 1 pension plus a ‘Tier 2 addition’. The enhancement to your retirement benefits is calculated as follows:”

Thank you 

Bimbly

If you google "like duration" (use quotes), several answers come up. For example, this from the BMA:
Like Duration
This means that the assessment for regular employment under tier 2 will take into account whether you are working whole-time or part-time in your NHS job.