We travelled for about 25 hours from start to finish!! Leaving the flat at 8.30 after handing in my keys, getting to Heathrow at 11.30 only to be told our return flight dates were 2 days over the ESTA limit so we had to pay £180 to change them!! Wasnt happy about this and told the travel agent so...he has since agreed it was their fault and refunded the money :) We flew out at 2.25pm on a 9 hour flight to Minneapolis.