Roses are roses.
Nope. Roses are red. Violets are blue. They told me this, so it must be true.
All these have arrived in four billion years. I can't believe that.
What would your time frame be and why? What is it about evolutionary processes that are believed today by virtually all those who work in relevant fields that you cannot believe made possible the species we see?
Living systems are complex systems. A common feature (usually a defining one) is robustness against phase changes (or, in layperson's terms, they are able robust against a relatively large/great amount of external influences and thus capable of adapting without changing qualitatively). However, complex systems do not exist in a vacuum. The climate is a complex system. It can withstand drastic emissions from things like volcanoes and not change the way mainstream climate scientists agree that the climate is changing today.
Do you know what the most successful, most abundant, longest surviving, and most adaptive organism on this planet is? Stuff like bacteria. More complex systems are robust only in a relative sense. Thus adaptive traits in some environment may remain adaptive enough to withstand a great many environmental changes. But environments/ecosystems are also complex systems. And they too can be influenced by everything from solar magnetic flux to beavers (the animal, not gratuitous shots in films). Which means that when an ecosystem undergoes a phase change, the entire set of adaptive traits of living system can quickly and utterly spell its demise and the adaption of its offspring or of another's. The fact that the Earth is littered with ecosystems that have complex internal dynamics influencing and caused by the living systems in these ecosystems, as well as being influenced by various types of solar flux, cloud cover, invading animal/plant/viri (viruses) systems, etc., means that we can have long periods of equilibrium in region A, and massive successive changes in region B forcing non-trivial changes, all at the same time.
The thing which powers all life on this earth is the Sun. Life is a violation of general physics as it is never in equilibrium and must constantly consume some form of energy in order to remain so. That means that all life is constantly out of balance and requiring ways to remain out of balance without entering into chaos. It also means that the planet itself must do so in ways that allow species to exist. But we know it hasn't always done that. There have been at least 5 massive extinctions, one which wiped out almost all life on this planet. The introduction of oxygen as more than a trace atmospheric gas occurred after life. And living systems as well as ecosystems shifted to adapt such that now the loss of this level of oxygen would kill of most of the species on this planet, just as has happened before.