In reply to Orgsm:
The numbers were too big for me to comprehend...so I decided to work out how far it would be as a daily commute, monday to friday for a year, with four weeks holiday not cycling (like I used to do...18 miles round trip a day) and it's 311 miles round trip a day, 155.5 miles each way.
An example of that daily commute is Central London to Kortrijk (Belgium) and back (or central London to Manchester) ...
Now I understand what an achievement it is...hats off!!