both the activities having different calender with different working hours. If u want to keep the duration same for both activities assign same calender for each.

Be aware that these weird durations factors can even increase the duration to display several days per calendar days, this can be very confusing.

In the following example about 3 WBS days represent a single calendar day and who knows how many work days.

Even with software that do not present such abnormal duration in days it can still be confusing as they still are subject to the effect of fractional days that affects the average work hours per day. My workaround is to display both duration in days and durations in hours in the same table, also the average work hours per day can be displayed using a very basic formula.

Look at the following screen, if the work hours for designated days of the week are equal within a single calendar, no matter if other calendars are different, the workdays will be as expected but if the work hours in the particular calendar varies then there migh be some discrepancy between calendar work days and the amount displayed, please look at activities 6 and 7. The effect of fractional days still can be elusive. Fractional days effect can be caused also when an activity start at the middle of the day and continues on the next day up to the designated hours per a single day. This can be further complicated if you have a work cycle different from a regular week like a cycle of 3ea 12 hour days and a day of rest in between. As Ron Winter said by displaying hours you can see what the software is doing.

The advantage of software that have individual factors for hours/day is that data entry in days is easier to enter and understand for calendars whose work hours per day are all equal no matter if 4 hours all workdays or 8 hours all workdays. For those calendars whose workdays have different work hours a marker shall identify them.