Applicants are advised to allow around 10-12 weeks for the entire process and, broadly speaking, this equates to 4-6 weeks to apply for endorsement and 4-6 weeks to apply for the visa. It may be quicker depending on where the person is applying from and if they can use the digital process for uploading their ID documents.
As the visa is not linked to a job application, individuals are free to decide on the date they wish to come to the UK and then work backwards to decide when they should submit their endorsement application.
Here is an example timetable for someone wishing to come to the UK on 1 July with their Global Talent visa.
Once they have received endorsement, they must apply for their visa within 3 months of the date the endorsement was given otherwise it will become invalid and they will need to apply for endorsement again.
Also, they cannot travel once they have submitted their visa application (stage 2) and so they will need to consider any travel plans they have already committed to and time their application accordingly.