How long does it take to sail from the UK to Australia?

The distance from London, UK to Perth, Australia is 7,823 nautical miles. if your boat sails at 20 mph, it would take 16 (24 hour) days 7 hours and 12 minutes to get there. At 30 mph, it would take 10 days 20 hours and 36 minutes. At 40 mph, it would take 8 days 3 hours and 18 minutes. Basically, the faster you sail, the less time your trip will take.