Applicants should submit their Schengen visa applications 6 months before their planned travel date, or 9 months prior if they intend to travel by sea. It is advised that travellers submit their applications 30 to 60 days before the trip. This allows sufficient time for processing. Applying close to the travel date can be risky during peak travel seasons when the slots for appointments are limited. Submitting the visa application early ensures a smooth travel experience.