The UK Export Control Joint Unit have issued a new service and performance code when dealing with export licence applications . In summary they are listed below,

SIEL Applications

70% of cases within 20 working days
99% of cases within 60 days

OIEL Applications

60% of cases within 60 days

The full text of the guidance can be found here:
https://www.gov.uk/government/publications/service-and-performance-code-for-export-licensing/ecju-service-and-performance-code