There is no single answer to this - small schedules (low number of activities) will tend to have more activities on the critical path than large schedules, but my heuristic is around 20% is good, below 20% better and knowing the probability of achieving on-time completion is heading 'south' once the percentage gets above 20% (particularly if there are multiple critical paths).
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24 years 9 monthsThere is no single answer to
There is no single answer to this - small schedules (low number of activities) will tend to have more activities on the critical path than large schedules, but my heuristic is around 20% is good, below 20% better and knowing the probability of achieving on-time completion is heading 'south' once the percentage gets above 20% (particularly if there are multiple critical paths).
For more on this see: https://www.mosaicprojects.com.au/WhitePapers/WP1037_Probability.pdf