For longevity-would it be better to leave the screen up or have it go up/down each time

Hi guys,
As the title said, would it be better to leave the screen up or have it go up/down each time for longevity. I have a LG Electronics HU715QW projector and 120inch vividstorm UST projection screen.
But I'm worried that I'll leave it open and my kids will damage it, this product is expensive.
Thanks!
 
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