Do you mean rest intervals?
I did 26 x 100 in total.
The first 21 I swam on a 2:00 interval -- getting a bit less than 30 seconds rest between 100s. I also gave myself a minute extra rest after 10 x 100.
The last 5 x 100, because it was more physically demanding, I swam on a 2:10 interval -- about 90 seconds work and 40 seconds rest.
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