The standard processing period for UK visitor visas from Canada lasts 15 working days which equals approximately 3 weeks after your biometric data submission. The time needed to process your application may extend during peak travel seasons and when you need to submit additional documents. You may opt for the Priority Visa service to expedite your application and reduce the processing time to 5 working days by paying an additional fee. Submit your application with enough time since processing and passport return times require 4 to 6 weeks minimum.