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That's not correct anymore, at least not around here. While the game time needed to letter in sports probably hasn't changed much, the opportunity to letter in something has drastically increased. A student can letter in choir, theater (including sets, etc.), academics, and even some types of volunteer hours, and the list goes on.
+1
I work in a very high achieving district. All league individual and team honors are expected, and All county & all state are frequent. even at this highly competitive school, if you dont letter in your 4 years, you didnt try. Band, Debate, theater.. You got it. LOTS of opportunity.