Vendt did 30X1000 on 10:30, which is a good set, but not nearly as impressive as 10:00 would have been.
Earlier this year, I did 6X700s on 7:10 holding between 6:45-6:52.
Earlier in my career...
6X100s on :59
6X1000s on 10:05
10K Fly for time
25K Free for time
Lots of other good sets with equipment... too many to remember.
The best 2 sets I have ever heard (not done) were as follows...
Dave Wharton did 12X100 IM on 1:10... not that impressive, except it was long course meters.
Also, a female athlete from Foxcatcher, I believe it was Karen LaBerg maybe... 1X100 on :59, 1X100 on 1:01, 2X100s on :59, 200 on 2:02... ...7X100s on :59, 700 on 7:07.
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John Kenny, Pro Triathlete, USAT Certified Coach -
http://www.frenchcreekracing.com Philly Masters and Open Water Swim and Multisport Events