Actually seeing Banks graph shows 4secs for the Spit and about 4.5secs for the 109 in a 45° bank at 400 mph. For 90° you can double the figures. So it would be 8secs for the spit and 9 secs for the 109 at these high speeds.

Where does the graph come from? Is it original test data or someone who wanted to write a book to sell it?