I have several calendars, one for 365 days a year without holidays, for tests like microbiology incubation, another for 7 days a week but allow holidays used during crunch time, and 5 days a week, a normal one.

I believe this causes problem with my critical path calculation, here's what happened -

Task 1 uses 365 days calendar, takes 5 days from Mon-Fri,
Task 2 follows and uses 5 d/w calendar, takes 2 days from next Mon-Tue.

The critical path calculation shows task 1 has 2 slack days, not in critical path

I tried to use Options>Calculation and set "Tasks are critical if slack is less than or equal to" as 2 days, but it shows too many tasks

Anyone has any suggestion on how to show the true critical paths Thanks for your advice in advance.