I don't know if this link will work, but TFL think it's a 50 minute walk.
I ain't a swift walker, not any more. I have just received the formal invitation to the meeting at I'll have 1.5 hours to get there from when my train is due. Time to stop by Condor.
I've walked from Kings Cross to Chancery Lane in about 25 minutes (the first bit is uphill) so that sounds about right.
any other interesting places such as bike/outdoor/tool shops ?