It cannot be estimated. It depends on how we release CFC's.
You cannot built thousand nanobots. And they would not survive in the ozone.
Ozone layer melting is very bad. Without ozone layer no life would be there.
A majority of the layers have ozone. But the layer you would find the most is in the Stratosphere. It is a proven fact that this layer has the most ozone.
When the ozone layer is completed, mankind would perish. There is no life without ozone.
See "What would happen if the ozone layer vanished?"
You want to protect ozone layer. It is a hell precious layer for us.
If the ozone layer vanished, there would be no life on earth. It is because the ozone layer protects us from the harmful and fatal UV radiations of the sun.
You can find the ozone in the stratosphere. It is the 2nd layer.
The ozone layer can be found in the stratosphere. It protects us from the UV rays.
Ozone is continually made by the Sun. Ozone made at Earth's surface does not survive to reach the ozone layer.
The Ozone layer protects us from the sun. If we didn't have the Ozone layer, our Earth would burn up as we would be fully exposed to the sun.
If there was no ozone, no life would be there. There would be mass extinction.