How long does it take to get better endurance? And how do you learn to pace yourself?

My 50 yard free time is 25.64 seconds

My 100 yard free time is 1:15 lol

I have no idea how to pace myself and I have horrible endurance, how can I work on this? Is it just trying as hard as I can during practice? I am 16

submitted by /u/yeaeay
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