What's the longest butterfly race you could swim?

I can swim VERY slow fly pretty much indefinitely(but it is really ugly.My reasonable looking fly is only about 100.)I can swim butterfrog much faster than my ugly stroke and do in indefinitely also(indefinitely means until I get bored,maybe 1500 if extremely motivated.)

I can swim VERY slow fly pretty much indefinitely(but it is really ugly.My reasonable looking fly is only about 100.)I can swim butterfrog much faster than my ugly stroke and do in indefinitely also(indefinitely means until I get bored,maybe 1500 if extremely motivated.)