Just for interest here's what those times equate to roughly
23 secs - 24.3 mph
22 secs - 25.4 mph
21 secs - 26.6 mph
20 secs - 27.9 mph
19 secs - 29.4 mph
Stolen from a post by Andyfromotley in 2010 about the last vist i think
I might have to change my name to CaptainSlow