Rick Chasey wrote:If it's for two weeks, I'd suggest forgoing the bike and focussing on your work.
Also, presumably if you're City airport, Box Hill's a long way away. It's more SW Londoners territory than E, though I might be corrected.
I've cycled to Box Hill from Charlton (SE7) it was 16 miles to Morden (where the GF lives) then another 15 max to Box Hill. I pooled the last section because the old dear was in tow. But it's well doable from City Airport, its adjacent to Charlton on the Thames. If you follow main A roads it's probably closer to 40-45 miles. But if you map it properly before hand simples.
KOM'ing it, that's a different story. I did 7:59 and I was blowing, I am a big lad though. Sub 6 minutes is never gonna happen, sub 7 maybe.