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Mine runs over 90 minutes
For both modes depending on the suction level, it seems to run for around 1-1.5 hours until it goes home to charge.
On half hardwood and have carpeting at a thousand square feet mine runs about 45 minutes.
Mine runs about 65 mins on low pile carpet on normal and about 45 mins on max.
The N79SE has a battery life of up to 120 minutes and runs for the same amount of time on auto mode as it does during a scheduled run.
It runs until low battery, the. It will automatically search for charger
It is supposed to run immediately after pushing the auto button if the battery is charged. As for the running time, it cannot automatically stop, it will continuously clean the place where it could reach until running out the battery.
About an hour and a half either way.
In either case, it runs until the battery gets low then goes and recharges. On standard vac mode you get around 4 hrs of cleaning. On max vac mode it's closer to 2.5.