I can't remember exactly, but doesn't 'your turn' comprise 3 components? Namely 'start of your turn', 'your actions', 'end of your turn'.
'start' being where you take ongoing damage, regenerations, benefits from other ongoing effects etc.
'end' being where you make saving throws etc.
'your actions' being where you make decisions and take actions.
So wouldn't 'readying an action' mean the end of 'your actions' and then moving into the 'end' phase?
Wouldn't delaying also be resolved the same way? Otherwise 6 seconds could be an awfully long time.
Well, readying an action is kind of the tricky part here. It doesn't specify when your saving throw occurs if you ready an action. I am leaning towards it acting like a delay in that regard, but I suppose I can see another interpretation as well.
However, delaying is not an action. More accurately, it's a "No Action". The following things happen:
1) Normal "Start of Turn"
2) Lose beneficial effects that normally would last until the end of your turn. (Note, you do NOT lose harmful effects yet that normally are lost at this point also).
3) End any effects or powers that require an action to sustain them this turn.
4) Wait until you enter initiative again.
5) Perform your Minor, Move, and Standard action as normal.
6) End Harmful effects that last until then end of your turn.
And the 6 seconds of a round is a pretty big abstraction. I avoid getting hung up on it being a literal 6 seconds. I tend to think of it as elastic, and *generally* about 6 seconds. Otherwise you could come into some impossible situations.
Think about this in a 6 second combat round: 1,000 characters are all lined up 12 "squares" apart, and all have a speed of 6. On one end of this line, one of the characters is holding a bomb that will explode in 10 seconds, and he is first in initiative. Everyone in the line delays until the person with the bomb takes his turn, which is composed of a move, trading his standard action for another move, and then hands the next person in line the bomb. Now the entire process repeats with everyone delaying until they are handed the bomb, until it passes through the hands of every single person.
Now, you have just a single combat round, with countless numbers of delays, and a bomb that is passed through 1,000 people x 12 squares each x 5 feet per square = 60,000 feet in 6 seconds, or 10,000 feet per second.
This means that the average speed of everyone involved was 6,800 miles per hour!
So yeah, don't get too hung up on 6 seconds of combat per round. ;-)