Estimate task duration

To calculate the longest sequence of critical tasks, you need to estimate the duration of each activity.

How to estimate the duration:

• Make educated guesses based on previous experience and knowledge.
• Estimate based on previous project data.
• Estimate based on industry standards.

Use the forward pass and backward pass technique to calculate float.

• Forward pass is used to find early start (ES) and early finish (EF) dates by using a previously specified start date. EF is ES + duration.
• Backward pass is used to calculate late start (LS) and late finish (LF) dates. LS is LF -duration.