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By 600 million years ago, the oxygen in the atmosphere reached about one-fifth of today’s level (21 percent).
Over the following 70 to 80 million years, the rate of diversification accelerated by an order of magnitude and the diversity of life began to resemble that of today.
We might have even less time if we don't start making improvements. New type of Green Algae produced O2, which created the Ozone Layer that protected life from damaging UV Rays and gave life a chance to progress.
(1.5 Billion Years since the Birth of Earth) - 2.4 billion years ago, oxygen in the atmosphere suddenly increased by about 10,000 times in just 200 million years.
Galaxy z is 13.1 billion years old, only about 700 million years younger than the universe. This dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.
The Earth has over 4 billion years left in its life, but humans only have around a billion years left before we have to find a new home. Oxygen is what makes the sky blue, molecules in the air scatter blue light from the sun more than they scatter red light.
The photo above is not to make you feel insignificant, it is only for reference and scale. Depending on your field of view, you would have to be around 100,000 light years away to see this Galaxy using the naked human eye.