250 miles a day - for a month

[tv_vt]

Was just reading about Lachlan Morton's plan to ride around the perimeter of Australia. Something like 14000 kilometers. To break the record (there's a record for everything), he has to average around 400 km a day, or about 250 miles, for over a month straight. 35 days or so.
Sounds like a perverted prison sentence to me, but what do I know. Is there such a thing as too much time on the bike?