4.5 billion years give or take. We've accurately measured for 100. Feel free to calculate it yourself. Your last sentence is my point. Your personal experiences and opinions are entirely irrelevant in deciding that facts.
Your point about geologists is also stupid because geology is a real science with a deep understanding of the scale of time.
Look what the British Geological Society says. Hardly a ringing endorsement..
Global climate change has typically occurred very slowly. However, research shows that the current climate is changing more rapidly.
www.bgs.ac.uk