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So I have used 12.7 GB with 1.1GB available... I haven't updated any apps since last Thursday. I now have 32 apps awaiting update to send me my (worthless) retina graphics data on my iPad 2. I'm worried I will run out of space. What are your experiences?

they dont weigh that much more dude, relax okay.
 
The amount required would vary from app to app. There is no rule of thumb. However, the more graphics' intense it is the more likely it will be bigger, maybe even significantly so. Apps that are mainly text wouldn't eat too much extra storage since vector text would adjust to new resolution, unless developer uses funky fonts.
 
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