Well, that's my 2nd fast over. 4 hours early but I guess 20 hours isn't bad. Also, the Eat - Stop - Eat documentation suggests that the body starts to get the most benefit from the fast from around 18 hours.
Things to note:
Make sure I have things to do to distract me - being on the helpdesk (and thus unable to workout, go for a walk etc) isn't conducive to an 'easy' fast.
It will get easier in time.
My belly was still pathetically grateful to be fed!