I think last year we took Little E at 6:30. It's dark around that time here. I think we'll do the same this year. He only goes to 2-3 houses anyway. He's going to be Elmo this year (although he was whining the other day that he wanted to be Big Bird, OMG).
Our town's TOT hours are from 4:30-7:30, so we're planning to go around 5:30. Unfortunately, there is a 100% chance of rain tomorrow evening so we'll be lucky if we hit 5 houses before turning home.