The calculated distance (air line) between Heerenveen and 's-Hertogenbosch is approximately 91 miles respectively 146 kilometers.
By car or train, the actual journey to 's-Hertogenbosch is certainly longer, as only the direct route (as the crow flies) between Heerenveen and 's-Hertogenbosch has been calculated here.
Air line (approximately)
146 kilometers
79 nautical miles