Wont stop cleaning

I set a schedule to clean at 1:00 am. It ran last night for the first time however it is now 1:10pm and it is still going. It keeps going back to the sick to recharge then comes out to clean more. The area being cleaned is only 1200 square feet. Not sure what is wrong

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Hello,  
Did you set the number of cleaning cycles? Has the robot already completed the cleaning task but continues to clean anyway?