Excluding enhanced propagation modes, what is the approximate range of normal VHF tropospheric propagation?

Normal VHF tropospheric propagation relies on the standard, everyday bending of radio waves through the lower atmosphere. Because the atmosphere's density gradually decreases with altitude, VHF waves are bent slightly downward, allowing them to travel just beyond the visual line of sight. Under normal, unenhanced conditions, the absolute maximum practical range for this type of tropospheric bending is approximately 800 km. Distances of 1600 km or 2400 km would require special atmospheric enhancements, making them incorrect for 'normal' propagation.