We get asked in support eventually when to use ‘day‘ and when ‘eday‘ when entering durations in Merlin projects. The answer is very easy:

• A ‘day‘ is a working day and references the project or resource calendar’s working day definition.
• An ‘eday‘ is a real day and has 24 real hours (thus ‘ehours‘).
• A ‘day‘ has as many working hours as the project calendar or the resource calendar of the assignment declares on a specific day.
• If you plan an activity having a work or duration of 1 day on a non working time point, it will be shifted to the next possible working time point.
• If you plan an activity having a duration of 1 eday on a non working time point, it will simply start then.

So here you are, some activity samples with day, eday, hour, ehour, planed on working time points, or not:

So if you understand how it works the following screenshot will not surprise you…

Note: In case you do not need the shifting of the activities to the next working day, you may set its ‘calendar’ to the ’24 hours’ calendar: