You can apply for a Tier 2 (General) visa if:
You need to be sponsored (ie have a certificate of sponsorship from a licensed sponsor) before you can apply to come to the UK to work.
The work you do in the UK must relate to the work of your sponsor organisation.
You can apply for a visa up to 3 months before the day you’re due to start work in the UK. This date is listed on your certificate of sponsorship.
You should get a decision on your visa within 3 weeks when you apply from outside the UK.
You can check the guide processing times to find out how long getting a visa might take in your country.
You can come to the UK with a Tier 2 (General) visa for a maximum of 5 years and 14 days, or the time given on your certificate of sponsorship plus 1 month, whichever is shorter.
Your stay must start no more than 14 days before the start date on your certificate of sponsorship.
You can apply to extend this visa for up to another 5 years, as long as your total stay is not more than 6 years.