Apart from the end to end madness earlier in the year where 3 of us did the 820 miles in 17 hours

My previous short time/long distance by bike was a 36hr/1300 mile run from the Algarve, Portugal to Caen via Madrid

Left home after 10 am yesterday, Buckingham (midday), Edinburgh (6pm), Bristol (3am). Collect 7am, Leeds(midday), Salisbury(6pm)

32hrs/1400 miles
http://g.co/maps/87u2h

What do you think could realistically be done?

I'm fancying a lands end to john o'groats and back over 36 hrs. 1600+ miles.

Anyone up for having a go in the summer?