The process to apply for a UK Visitor Visa takes about 15 working days once your biometric data has been submitted. The procedure needs 3 weeks to conclude and does not include weekends and public holidays. To expedite your travel you can select the Priority Visa service which reduces the processing time to 5 business days if you pay an additional fee. The processing duration of visa applications depends on their volume at the time so it is best to submit your application at least one month before your planned departure.