Convert lets you schedule your experiments or campaigns to start and stop them at specific times.
Setting or Scheduling a Start Time
Convert has an option to schedule the start time of an experiment. Just access the experiment summary screen and when changing the Status select the Schedule option:
This will allow you to start the experiment on a date in the future. Be aware that the experiment will start at 12 am in the GMT timezone.
Setting or Scheduling a stop time
To do this you need to access the Stats & Settings section in your Experience Summary Screen.
Just set the maximum days setting on the Stats and Settings section. Which would be the days passed since the experiment is activated.