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Depends on the bubble.
A silver/white bubble is air. It won't go away.
A silver/white spec (like pin head, or group of pin heads) is dirt/dust. A small amount, especially around the edges, is normal.
A lumpy distorted bubble that gives a fish eye look is trapped water. It will go away. Depending on how hard/well a tinter squeegees depends on how much water is left behind. I personally squeegee very hard to prevent water bubbles. It can take up to 30 days especially if the car is garaged. It can take even longer in the winter. I once left a quarter sized water bubble in my full metal tint (which dries slower) on my own car. It was there from October to April!!!!
Do you have pictures of these bubbles? If it gives the fish eye look it will go away. If you have bubbles "everywhere" and on all the windows chances are the window tinter is just a limp wrister and doesn't squeegee hard.
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