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Depends.
If you're using the same level of jpeg compression, it'd take around 10+ resaves and edits (it wont compress as much if you're just renaming it and saving it as a new file, but say you edit out one pixel, it'll compress more as its a new pic). Even then, you have to look rather hard to notice any difference at all.
Now, the quality of compression on your camera could be much higher than that of the tool you use to resize and this could be causing the quality loss. I highly suggest using the Microsoft power tool image resizer to do resizing. It uses a pretty high quality compression on resizes and is near photoshop level.
Simply resizing does not cause quality loss.
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