Detailed studying of long-lasting processes is enabled by the time lapse acquisition mode of NIS-Elements. The achievable experiment duration is limited by the hardware abilities of your PC only. Invoke the 
Acquire > Capture Timelapse > Capture Automatically command to set the experiment up:
Figure 124.
The table enables you to define one time phase.
Duration, interval between images or number of Loops of the phase can be adjusted. The cells are bound together, so you just need to set two of these parameters and the remaining parameter will be calculated automatically.
The flag mark indicates the Duration/Loops priority. For example: if the camera exposure time exceeds the defined Interval between frames, than the experiment settings are not achievable - only the marked column will be pushed to be correct. You can set the priority column by clicking on its caption.
The following options can be used with this type of ND acquisition. Options common to all types are described here.
If this option is selected, the lamp is turned off whenever there is a long-enough gap between two acquisitions.
Warning
It takes a little time for some lamps to reach the set intensity. In such case, we recommend to use the Wait(); macro function before the capture is performed.
Press the button to display the following window:
Figure 125.
Define user hot keys which run user events during time-lapse acquisition. Simply click inside the Hot key field of the User events window and press any key combination you want to assign to the event. Then you can enter the event description. A macro command can be specified which will be executed when the event occurs (is triggered by the user). When the event occurs, the specified command is run and a marker is placed to the time line of the ND2 file.
These options are shown after clicking . Following features are available.
See Common ND Experiment Options.
Note
It can be determined whether the focusing shall be performed at the beginning of the whole experiment or at the beginning of each phase. If the auto-focus is set to be performed Before each Phase and the ND Experiment contains just a single time phase, the automatic focus will not be performed. To run auto focus, use the At the Beginning option.
See Executing macro commands during ND acquisition. Runs a command which is executed before or after each time loop.
Tip
You can reduce the number of executions by inserting the function using the Execute Every Nth... command from the drop-down menu.
A different set of macro commands can be executed for each time phase. Select a phase from the drop-down menu and define the commands for it. Or, click the button to use the same settings for all phases.