Elevation training as a highschooler

I’m not sure but I’d recommend looking into peak performance’s summer altitude camp. You’ll get to run in keystone and make some amazing friends and memories while training hardcore in the mountains

Me and a few buddies are planning to go to elevation this next summer and I was wondering how much it would be worth it.High cps test altitude training is the practice of training at high elevations. In sports, high altitude typically means at least 7,000 to 8,000 feet ...
Altitude training can produce slow recovery due to the stress of hypoxia. Exposure to extreme hypoxia at altitudes above 16,000 feet (5,000 m) can lead to considerable deterioration of skeletal muscle tissue. Five weeks at this altitude leads to a loss of muscle volume of the order of 10–15%.

How long the benefits last will vary from person to person and depends on a wide variety of factors.

If you are going to do this, 8 weeks before you head up get your iron status checked. If it is not at least in the middle of the normal range for total iron and ferritin consider increasing your iron intake---and get it checked before you leave for altitude.

If you go to a place that has the capacity for you to get supplemental oxygen to do some simulated sea level training, do it. The famous "live high, train low" studies in Utah had them living and doing a lot of training at Deer Valley with one group coming down to Salt Lake City to do speed work. (~9000 ft in Deer Valley and just over 4000 ft in SLC). You can do the same thing with supplemental oxygen but that requires some equipment (not to mention O2 tanks).

As for how long, I think at most it would be 30 days so you would get a few early season meets and then your body is going to readjusted to SL. For some people it probably goes away faster.

I do not think they are going to 16,000 feet. There is no place in the US where anyone lives at that altitude.