Imagine you are in a big stadium or sports arena.
It’s sealed, so that no water can come in or out.
1 drop of water falls. One minute later 2 drops. Then 4, 8, 16 … you know.
You are siting at the top of the arena. Most likely you realize what’s going on after 47 minutes, when the arena is half-full.
After that you have one minute to react.
… according to this example. Interesting.