I made my goal of 6000 meters... Here is what I did:
3x600 @ 9:15
3x500 @ 7:45
3x400 @ 6:15
3x300 @ 4:45
3x200 @ 3:00
Total workout time 1 hr 35 minutes.
That is my longest swim since college and caps off the most swim yards I have done in a week since college as well (15766 yards).