So... I'm thinking about a day out in the North Downs, the vague plan so far is to tack these two routes together ( there's an option to do that in the route book ) to make a full day ride.
The two full routes total about 38 miles with a ride time of 5 to 7 hrs plus lunch, punctures and getting lost
There's also a bailout option of cutting out part of the second loop if time is getting short.
If you just want to do the first loop the book says it's about 16 miles and 2 - 3hrs.
Summery of the plan so far... 9:00 start riding, get lost in Kent for about 7 hrs. About 4:00 ish hit the pub for a quick pint and head home suitably knackered
Let me know if you want to join