To manage the observation sessions, tap to reveal the Sessions screen. The first setting on the Sessions screen defines when the blocks begin. To change the starting time, tap the timestamp you want to change and use the date/time controls to set the starting time. In the default IES Literacy Grant schema that comes with the app, blocks last five minutes. Timer settings determine the length of these blocks. If you need to change the block duration, follow this link to learn how to modify the timer settings.