The Continuous Cleaning feature on your DEEBOT OZMO 930 / 937 allows your robot to seamlessly return to the charging station in the middle of a cleaning your home, recharge itself, then go back out and finish up.
It's very important to use this feature when first creating a map - especially when you have a large home. To enable, click on the three dots on the upper right hand corner of the app:
Then turn continuous cleaning ON:
Now your robot will always complete the job - no matter how long it takes.