Only a small amount of something is usually required to produce a great effect.
drop in the sea
A very small or insignificant amount; something of little importance.
drop in the ocean
A very small or insignificant amount; something of little importance, …
drop in the pond
spit in the ocean
lead time
The amount of time between the initiation of some process and its comp…
fair share
A significant amount, often implied to be excessive or inordinate; a g…