Canada (Fastest)
Study 2 years → Post-study work 3 years → PR eligible → citizenship. Total: 5-6 years.
Australia
Study 2-4 years → Post-study work 2-3 years → Skilled visa → PR → citizenship. Total: 8-10 years.
USA
Study 4 years → OPT work (1-3 years) → H1B (3+ years) → Green Card (5 years) → citizenship. Total: 12-15 years. Longest path.
UK
Study 2-4 years → Post-study work 2 years → Work visa 5 years → ILR → citizenship. Total: 10+ years.