42km each way. Redhill to Canary Wharf.
Only do it about once per week if the weather is dry.
Really quite enjoy it as it is an occasional commute and gets me away from the train. Nice quiet back roads until Coulsdon. Then into traffic. Not too bad as long as I remember not to get too angry and just flow along with the traffic.
Utterly tedious amount of traffic lights though.
While not the greatest training, it certainly lets me clock up some miles in an otherwise dead time on tube/train. Also frees up some weekend time as I feel less pressured to put some miles in.