cycling t shirts

how many shirts is normal to wear?
per five days? Like i have 10 t-shirts(i have gone on a t-shirt thing) so that means i can wear a different shirt for 2 weeks and then start the shirt cycle over. Is that not enough?
also are t-shirts good for the enviroment?
loll i wear like 4 shirts per day
but i dont know O_o
Performance
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BNWT biking tshirt XL cycling mountain downhilling bike $10.97 |
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BNWT biking tshirt XS cycling mountain downhilling bike $10.97 |
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BNWT biking tshirt M cycling mountain downhilling bike $10.97 |
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Le Tour De France Cycling Logo Mens Ringer Tee T-Shirt $12.60 |
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Le Tour De France Cycling Logo Mens Ringer Tee T-Shirt $13.80 |