that depends on how you have your critical path defined it can be zero days total float or longest path
if you have it set to zero days. If you do not set a project must finish by date then the late dates will match the early dates and the float will ALWAYS be zero
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16 years 3 monthsyou must have an end date
you must have an end date either on the last activity or project must finish by adte
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7 yearsI have selected the Longest
I have selected the Longest path option but not given the project finish date. Then why it shows some activites in red bar
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16 years 3 monthsthat depends on how you have
that depends on how you have your critical path defined it can be zero days total float or longest path
if you have it set to zero days. If you do not set a project must finish by date then the late dates will match the early dates and the float will ALWAYS be zero