The Home Office advises that Stage 1 of the application process (i.e. the application to be endorsed) for the Tier 1 (Exceptional Talent) visa can take up to eight weeks from the time the Home Office receives your application.
Within these eight weeks, Tech City UK has up to 25 working days to review your application. For applications eligible for one of the three fast track options, Tech City UK will make a recommendation on endorsement to the Home Office within 18 working days.
Please note that, if endorsed, Stage 2 of the application process for the Tier 1 (Exceptional Talent) visa (i.e. the application for the visa itself) will still need to be completed.
The Home Office advises that Stage 2 of the application process can take around three weeks if applying from outside of the UK, and around five weeks if applying from within the UK.