The calculated distance (air line) between Troyan and Veliko Tŭrnovo is approximately 48 miles respectively 77 kilometers.
By car or train, the actual journey to Veliko Tŭrnovo is certainly longer, as only the direct route (as the crow flies) between Troyan and Veliko Tŭrnovo has been calculated here.
Air line (approximately)
77 kilometers
42 nautical miles