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

Normal durations for all the activities
Crash durations for all 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

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Construction Planning and Management
Total float for any activity is defined as the difference between

Its latest finish time and earliest start time for its successor activity
Its latest start time and earliest finish time
Its earliest finish time and earliest start time for its successor activity
Its latest start time and earliest start time

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