Earth could continue to host life for at least another 1.75 billion years,as long as an asteroid or some other disaster doesn't intervene.
Somewhere around 1.75 billion and 3.25 billion years from now earth will start to travel out of the solar system habitable zone and into hot zone.
The evolution of complex life on Earth suggests the process requires a lot of time.
Simple cells first appeared on Earth nearly 4 billion years ago. "We had insects 400 million years ago, dinosaurs 300 million years ago and flowering plants 130 million years ago,"Anatomically modern humans have only been around for the last 200,000 years — so you can see it takes a really long time for intelligent life to develop."
"If we ever need to travel to the other planet, Mars will be the best option".
Regards to all,