Personally, i would,nt call any earlier than 4pm, purely from the point of view that many householders are'nt in any earlier than this.
Also legally, you cannot work after 8pm, that gives four hours of 'prime time' canvassing.
Doorknocking is demoralising for most, even at the best of times! so why make the job even harder by calling at the wrong time.
Calling as early as ten in the morning might get you some angry responses from shift workers as well!
But its down to whatever you feel happy working with really,
All the best
Paul
