You are opening a project in MSP. When it opens, the duration for some tasks is increased. There are no assignments and the task is set to a fixed duration.
The expectation is that the duration does not change.
Release : All supported releases
This is caused by the Standard Calendar and the non-working days that have been defined.
This is working as designed as the concept of a project calendar does not exist in Clarity. Clarity uses the Standard calendar for the majority of its scheduling (when the auto-schedule job is run). Also, Clarity is a resource-based scheduler, so the calendars used in scheduling are only the ones that are associated with resources on that project team.
There are two options