From Edge of Darkness Wiki
Different tasks demand different times to accomplish them. It takes longer to rebuild a car engine than it does to stab someone with a knife. Storytelling has three types of actions: Instant, Extended, and Reflexive.
An Instant Action is immediate and takes a single dice roll and a single Turn (3 seconds)
An Extended Action is resolved with a series of dice rolls, and your successes in each roll are tallied, working to collect the total needed to complete the task. The Storyteller usually determines the total number of successes needed and the time needed for each roll.
A Reflexive Action is an instinctual task that takes no appreciable time, such as reacting to surprise or noticing something out of the corner of your eye. Performing a reflexive action does not prevent a character from performing another action within a turn. A Reflexive Action is rolled similarly to an Instant Action with a single dice roll.
A Dodge is an Instant Action which can be declared at any time, regardless of position on the Initiative roster. Dodging is both a core maneuver as well as a type of Action assigned to various Instant Actions throughout the game line such as Fighting Style maneuvers, powers, etc.