You are totally right, I did not know that it takes that long to recover from an all out 400m sprint. So I totally understand that being naked at a high school for over an hour is a little bit extreme
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I have another suggestion then.
You may want to start this one a bit earlier than usual to lower the risk of getting caught.
Start out wearing a sports bra, panties of your choice and a pair of shorts. (Shoes and socks are your choice and are not included in this dare)
You will do 5 laps, but you are not racing your fastest time.
Time the first lap you do. This is the goal for the next laps. You will try to be within 5 seconds of this time for the next four laps.
For each lap you miss the target time with 5 seconds or more, remove one piece of clothing.
Now, when you are done you are free to walk home in whatever clothes you are left in, if you feel comfortable doing so. If not, you may edge once for each piece you had to take off before putting them back on and going home.
And, if you ended up completely naked you have to orgasm once in addition to the edges before putting your clothes back on. You may find a secluded spot if you want to.
I hope this one is a little bit more doable.