How fast does coffee dissolves in hot water?

It's tricky to give a single number for how fast coffee dissolves in hot water. It depends on a lot of factors:

* Grind size: Finely ground coffee dissolves much faster than coarsely ground coffee because it has a larger surface area exposed to the water.

* Water temperature: Hotter water dissolves coffee faster because the molecules move more quickly and have more energy to break down the coffee grounds.

* Type of coffee: Different roasts and beans have different chemical compositions, which can affect how quickly they dissolve.

* Amount of coffee and water: The ratio of coffee to water will impact how quickly the coffee dissolves.

* Agitation: Stirring or shaking the coffee will speed up the dissolution process.

General Observations:

* Initial stages: Most of the soluble coffee compounds will dissolve within the first minute or two of brewing.

* Full extraction: It can take several minutes (or even longer for coarse grinds) to extract all the soluble compounds from the coffee grounds.

Instead of thinking about a single "dissolving speed," it's better to consider these factors and experiment to find your preferred brewing method and time.

Do you have a specific coffee brewing method or situation in mind? I can give you more tailored advice if you tell me more about what you're interested in.