In CPM project network planning, Total Float (TF) of an activity is calculated as:
ALatest Start Time (LS) - Earliest Start Time (ES)
BEarliest Finish Time (EF) - Earliest Start Time (ES)
CLatest Finish Time (LF) - Latest Start Time (LS)
DEarliest Start Time of next activity - Earliest Finish Time of current activity
Explanation
Total Float TF = LS – ES = LF – EF. It represents total allowable delay without delaying project completion.

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