If I have a scenario whereby I am using a single soft light on say a still life subject. The areas not receiving much light are obviously going to want a longer exposure for them to register on the film. Increasing the exposure for the shadows is in turn going to make the areas receiving the lions share of the light brighter and could even become too bright. In situations like this, I am assuming that reducing the development time would be one way to control the highlights. Back to my question If the normal development time is 9 minutes, reducing this by say 20% would give a development time of 7 minutes 20 seconds. Would this time be sufficient for the shadow areas to have been developed ?