Hello Joshua,

 I am just checking your progress on the issue. If you require any further assistance please do not hesitate to ask.

The xamGantt works just like MS Project. Tasks are typically defined such that the work being done is done during "working hours". The default working hours in project are Mon-Fri 8am-12pm and 1pm to 5pm. So tasks that are using non-elapsed durations are using the working hours specified by the calendar of the project. Tasks that are using elapsed durations are essentially being treated as though the project were using a 24 hour clock (i.e. every day has 24 working hours). The "e" is used (as it is in MS Project) to indicate that the duration is "elapsed" and therefore ignores the working hours. So you can change the DurationFormat of the Project's Settings to ElapsedDays instead of the default days but as you notice you will see "edays" or similar string representation. Another alternative would be to set the calendar of the project to be a 24 hour calendar. Here's a code example of doing that:

var project = new Project();

// create a 24 hour clock
var calendar = new ProjectCalendar();
var days = new ScheduleDaysOfWeek();
var allDay = new ScheduleDayOfWeek();
var allDayHours = new WorkingHoursCollection( new TimeRange( TimeSpan.Zero, TimeSpan.FromDays( 1 ) ) );
allDay.DaySettings = new DaySettings() { IsWorkday = true, WorkingHours = allDayHours };
days.Monday = days.Tuesday = days.Wednesday = days.Thursday = days.Friday = days.Saturday = days.Sunday = allDay;
calendar.DaysOfWeek = days;
calendar.UniqueId = "24Hour";

project.Calendars.Add( calendar );
project.CalendarId = "24Hour";

var settings = new ProjectSettings();
settings.MinutesPerDay = 60 * 24;
settings.MinutesPerWeek = settings.MinutesPerDay * 7;
settings.DaysPerMonth = 30;
settings.NewTasksAreEstimated = false;
project.Settings = settings;

You'll notice I'm also setting the MinutesPerDay, etc. so that if a user enters 2d that is translated to that many minutes. Again this is the same as it would be in MS Project.

The "?" is used to identify an estimated duration. You might want to look at the IsEstimated of your task as well as what you have set for the Project's Settings.NewTasksAreEstimated.

Hello Joshua,

 I have further investigated your issue. If you set duration property it will return the working hours. For example if you set Duration = new TimeSpan.FromDays(1) will return 2 additional days, because one day has 24 hours(3 x 8 working hours). In order to get the real time you have to set DurationFormat too. The question mark indicates that the time is estimated. In order not to show the question mark you can use ManualDuration

Please do not hesitate to let me know if you have any further questions.

Why does it says "days?" or "edays?" when I enter items programatically.

With the ? at the end.