There are 1,255 nautical miles between Dublin Ireland and St. Petersburg Russia, which is the closest European port. At 20 mph, it would take 62 hours and 45 minutes, or 2 full (24 hour) days and 14 hours and 45 minutes to get there. At 30 mph, it would take 41 hours and 48 minutes, or 1 full day and 17 hours and 48 minutes. At 40 mph, it would take 31 hours and 18 minutes, or 1 full day and 7 hours and 18 minutes. Basically, the faster your sailboat is, the less time it will take.