I have a bunch of wooden arrow shafts that I put aside for one reason or another for about 10 years. They were wrapped in bunches, and stayed straight. In Sacramento, the garage where they are stored heats up to about 120-130 degrees in the summer sometimes. I got a bow that I thought they would be good for, and made up a dozen arrows. It's like shooting arrows made of glass; they fracture if you look at them crooked. I assume the heat dried them out too much to be any good as arrow shafts anymore. OTOH, I think well sealed arrows would last a lot longer, as they wouldn't dry out as fast.