Looking at travel plans for 2012-2013. Still working, so I cant do one long trip. Been thinking about somthing along the lines of the following.

JFK-LHR-TLV-MAD-LHR-DEL-HKG-SYD-CNS-SYD-SCL-EZE-MIA-SJU-DFW-JFK.

1) How long could I break this up into. I have read one year, I have read one year from ticketing, and I have read that the last segments can be open and booked at a later time?

2) Would I be violating rules if I broke the trip up (Say by returning to JKF after LHR, SCL, MIA)?

3) The cities are not set in stone. If fact they are all places I've been before, and wouldn't mind going back to.

4) I have not started to look and see if any seats would be available on these legs(Via EF). Just wanting to see if it is feasible, and how it would price out (in J) vs. Individual trips.

Thank you.