## Duration class

Represents duration in a project.

The Duration type exposes the following members:
## Constructors
| Name | Description |
| :- | :- |
|Duration()|Initializes a new instance of the Duration class|
## Properties
| Name | Description |
| :- | :- |
|time_span|Gets [time_span](/tasks/python-net/aspose.tasks/duration/) instance of this Duration object.|
|time_unit|Gets time unit type for this object.|
|is_estimated|Gets a value indicating whether time unit is estimated.|
|is_elapsed|Gets a value indicating whether time unit is elapsed.|
## Methods
| Name | Description |
| :- | :- |
|add(d)|Adds specified duration to this duration.|
|add(val)|Adds specified double value to this duration.|
|subtract(d)|Subtracts specified duration from this duration instance.|
|subtract(val)|Subtracts specified double value from this duration instance.|
|parse(p, value)|Converts the specified string to the instance of [Duration](/tasks/python-net/aspose.tasks/duration/) struct.|
|parse_time_span(value)|Parses duration string in format "PT--H--M--S--".|
|to_double()|Converts Duration object to float value.|
|convert(time_unit_type)|Converts Duration object to another duration with specified time units.|
|equals(other)|Returns a value indicating whether this instance is equal to a specified object.|

### See Also

* namespace [aspose.tasks](/tasks/python-net/aspose.tasks/)
* assembly [Aspose.Tasks](/tasks/python-net/)