Postpublished at 10:27 British Summer Time 6 July 2023
Andy Zaltzman
Cricket statistician on Test Match Special
Answer: 171.
According to the Cricinfo data, from the end of the Second World War to the start of the third millennium, 330 sixes were hit in 147 men's Ashes matches, at a rate of one for every 170.5 overs bowled.
Since then, there have been 413 sixes in 62 Ashes Tests. Ben Stokes hit as many sixes in three balls to move from 82 to 100 at Lord's last Sunday, as were hit in the entire five-Test series in Australia in 1990-91.