Battery usage concern

Have the robot for a couple of days and a little concerned about the battery usage. Did not run a full clean yet in the house, but for a 18m2 it took 21 minutes and used 20% of battery in CleanGenius VacMop Deep Cleaning = Off.

I'm afraid it is not going to do a full house with one battery cycle. This is a 3bed 2bath house (with a 1200sqft area of robot working I'd say). The area is 80% tile, with a low profile rug in the living room.

Once I do a full cleaning I will post more details, but wondering anyone else having this feeling of fast battery drainage.

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I also noticed that the battery drains pretty quick, and my house is only 400sq ft.