Planned End Date is not calculated when the no of planned duration hours entered is more than 24 hours
Most Probable Cause
In Istanbul, Planned duration on planning console is not giving correct results for sure. To add to your above use case, try adding 1 10 00, which means 1 day and 10 hours. So technically it should be 2 days 2 hours but PC only shows 2 days. It seems like the PC is not calculating correctly when more than 8 hours is entered.
There we have discrepancies in the duration to days conversion in the past releases.
As a workaround, Please import the attached xml file to your instance.
Both the above mentioned issues has been fixed in London.