I am vey worried about the start date and the end date given in my tier 2 visa, which may affect my application of ILR in the future.
In my CoS,
the start date is 16/10/2017
the end date is 15/10/2022 (five-year visa)
Then I submitted the visa application on 10/11/2017,
and result released with confirmation letter and stamped passport on 14/11/2017.
In the letter, it is clearly stated that I will have permission to be in the UK as TIER 2 (GENERAL) MIGRANT from 5/2/2018 to 29/10/2022, and my BRP will be available for collection from 12/2/2018.
Based on the above, I get 2 questions:
1. I noted that I have to work within 3 months after the entry clearance. Does it means that I have to work before 13/2/2018 (14/11/2017 + 3 months)? My BRP will be just available on 12/2/2018....
2. Why the tier 2 visa granted period is from 5/2/2018 to 29/10/2022 which is less than 5 years? Is it something wrong by the HO and should I make a contact with them? Based on the period granted, will my ILR application in the future be affected (less than 5 years......)?
Could anyone help me?.. I am very worried and can not find the answer on the internet....

Thanks.