When I was setting up my Google ads campaign I have an option to choose the ending late for the ads. Since that time, I've thinking of how long Google Ads campaigns typically last. I know some people run short-term campaigns for promotions, while others keep ads running continuously to maintain visibility and I wish to know how they are doing it. 

I know I need to keep monitoring the ads consistently to see the performance. I plan to adjust based on performance metrics can help extend the lifespan of a successful campaign while keeping costs manageable. 

How long do you usually run your Google Ads campaigns, and what determines when you pause or stop them?