Can you...

Can you take a clone off the plant right before you are about to harvest it?

How much time does it cut off by cloning and what time schedule for the lights do you think is best?

yeah you can take a branch off of the plant whenever but you dont want a bud on the cutting you want 24-18 hours of light for the new "plant" basically your putting it back in veg stage.

How long do you need to leave it in 18/6 veg before you send to flowering again? I was thinking about cloning 3 or 4 new plants off my ones in flowering right when I harvest so I am going again.

When you rejuvinate plants after harvesting do you put that on 18/6 veg like the clones?