D20 ULTRA ROBO SMART BUT TOO SLOW

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D20 Ultra Robo is a smart machine but dead slow. Cleaning 500sqft takes 180minutes with battery getting drain in between increasing the time. Machines are supposed to reduce the time and efforts of human whereas this is vice-versa  

try splitting the cleaning into smaller sections and make sure the battery is fully charged before starting, otherwise it keeps stopping and charging which drags the time even more.

Also it had a lot of obstacles to move around.  Straight lines always quicker.  Could split the clean to two days. Different rooms different days