The record is actually 106 days; there was some confusion at the start of the world cycle race but that's now been clarified. That was set by a guy who had a camper van driving behind him all the way, but there's only one record recognised by Guinness. Barring disaster he's on pace to break it, and even including disaster he could probably still break the unsupported record, which is 150+ days (and isn't recognised by Guinness as a separate record, but who cars about them anymore?)
Mike is a multiple winner of 24h MTB races and he raced the Tour Divide last year, so he's always been a favourite to win this. He's also a Yorkshireman, despite now living in Bristol, which must help him no end!