Typically how long would it take for a Thai national to receive a visa to take up a university place in UK?

Customers applying for a visa from outside the UK:

 

Processing Time: 90% of non-settlement applications within 3 weeks, 98% within 6 weeks and 100% within 12 weeks of the application date (where 1 week is 5 working days).

 

https://www.gov.uk/government/organisations/uk-visas-and-immigration/about-our-services#service-standards

Customers applying to remain on a temporary basis including as spouses, workers, Tier 1 general and entrepreneurs, students and organisations seeking to sponsor a worker -   8 weeks (5 working day priority or the end of the next working day super priority services - please check your application type for available priority services)   https://www.gov.uk/government/organisations/uk-visas-and-immigration/about-our-services#service-standards