I had the distinct pleasure of meeting Ken in Dubai and he is one knowledgeable fella. Big congrats to you and your spouse! And what a watch! I find the dual pallet forks to be especially interesting to me. Mesmerizing.
But normally, probably only around 340 km. And if I drive fast, like around 130-140 kph (our speed limits are rarely this fast in USA, sometimes in Texas they allow you to drive around 130 kph and people push it to 140 kph), probably only around 300 km is my guess.