Construction Planning and Management
Earliest finish of an activity is always

Less than or equal to earliest event time of the following node
Less than earliest event time of the following node
Greater than earliest event time of the following node
Greater than or equal to earliest event time of the following node

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Construction Planning and Management
Crash project duration is obtained by summing the

Normal durations for all the activities
Crash durations for all the activities along the critical path obtained by taking into account the crash duration for all the activities
Crash durations for all the activities along the critical path obtained by taking into account the normal duration for all the activities
Crash durations for all activities

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