Required behavior of elements that run in a Timeline.
In addition to implementing this behavior, a Timeline element must communicate with Mission Control to let it know its state. Mission Control will wait for updates from the Timeline element before it itself progresses. Refer to TimelineElementFeedback for the methods Mission Control exposes for the Timeline element to use to communicate.
Sets the time you want to delay before element execution which is used for asynchronous processing scenarios. For example, if you want to execute GimbalAttitudeAction after ShootPhotoAction, you should set delay time in GimbalAttitudeAction. Because it takes 1 to 2 seconds to take a photo, the gimbal's commands will not be responded during this period, so we need to delay 2 seconds before turning the gimbal to ensure that the gimbal movement is executed correctly.
The time you want to delay before element execution, unit:second.