According to the Food Channel, the world's largest zucchini on  record was 69.5 inches long and weighed 65 pounds. The grower was  Bernard Lavery of Plymouth Devon, UK.
Munchen (Germany) is 820 kilometers (or 510 miles) from Amsterdam (The Netherlands).
From Frankfurt take the A2 to Wurzburg, then the A7 to Rothenburg. The distance is about 120 km, about a two hour drive. From Munich take the A8 Autobahn to Augsburg-West, then B2 to Donauworth, then the scenic Romantic Road to Rothenburg, or, faster is to continue on the A8 and take the A7 to the Rothenburg exit. It should take around 2 hours and 45 minutes to drive this route.