The calculated distance (air line) between Buchholz in der Nordheide and Wandsbek is approximately 20 miles respectively 32 kilometers.
By car or train, the actual journey to Wandsbek is certainly longer, as only the direct route (as the crow flies) between Buchholz in der Nordheide and Wandsbek has been calculated here.
Air line (approximately)
32 kilometers
17 nautical miles