20 minutes in townhouse or large apartment
Quick answer
20 minutes covers roughly 380 square feet at a realistic 19 square feet a minute, which is about 27 percent of townhouse or large apartment at 1400 square feet. Expect to recharge partway, or to split the home into zones.
A widely used service rule of thumb rather than a specification. Treat it as a starting point and let your own manual win.
| Home | Floor area | Covered in one charge | Enough for one pass |
|---|---|---|---|
| Studio or one bedroom | 600 sq ft | 380 sq ft | About 63% |
| Small apartment | 900 sq ft | 380 sq ft | About 42% |
| Townhouse or large apartment | 1,400 sq ft | 380 sq ft | About 27% |
| Family home | 2,000 sq ft | 380 sq ft | About 19% |
| Large home | 2,800 sq ft | 380 sq ft | About 14% |
| Very large home | 3,800 sq ft | 380 sq ft | About 10% |
| Mode | Runtime | Area covered |
|---|---|---|
| Eco or standard, the rated figure | 20 min | 380 sq ft |
| Medium | 11 min | 209 sq ft |
| Boost or max | 6 min | 114 sq ft |
Machines and packs across the range
Shown across the price range rather than cheapest first, so the grid reflects the whole category.
- ROPVACNIC
ROPVACNIC Robot Vacuum and Mop Combo 5200Pa Suction Robotic Cleaner
$99.99 Check pricePrices change often - Shark
Shark Cordless Pet, Cordless Lightweight Stick Vacuum Cleaner, IY143H
$199.99 Check pricePrices change often - roborock
roborock Robot Vacuum Mop with LiDAR, 10000Pa, Anti-Tangle, 7, 9 Weeks
$299.99 Check pricePrices change often - roborock
roborock Qrevo Series Robot Vacuum and Mop, Upgraded from Qrevo S
$479.99 Check pricePrices change often - roborock
roborock Qrevo Edge 2 Robot Vacuum and Mop, 25,000Pa, 3.14'' Ultra-Slim
$1,099.99 Check pricePrices change often
Why the rated figure is not what you get
Around 19 square feet a minute in a normally furnished room, which is well below the open floor figure makers quote. The figure manufacturers quote is measured on open floor with no furniture, and a normally furnished room costs a machine a large share of its time in turning, repositioning and edge work rather than in covering ground.
The mode matters just as much. The rated runtime is the eco figure, and boost typically runs the same pack down in a little over a quarter of the time. A machine advertised at 20 minutes gives roughly 6 minutes in its highest setting, which is why boost is best used in bursts where the floor actually needs it.
Bin size and how often you empty
Runtime decides whether the job finishes; bin capacity decides how often you are involved. In townhouse or large apartment a typical onboard bin needs emptying roughly every 3 days of regular use, and a bin that is full stops picking up well before it looks full because the airflow path is restricted.
A self emptying base changes that arithmetic rather than the runtime. It holds 2 to 3.5 litres and moves the chore from every run to roughly every 4 to 8 weeks, at the cost of bag money, a few seconds of real noise, and genuine floor space.
How to cover the gap
Three options, in rough order of cost. Split the home into zones and run them on different days, which costs nothing on any machine with a saved map. Let the machine recharge and resume, which most current robots do automatically but which turns a one hour job into a three hour one. Or buy for the area rather than the price.
On a cordless stick the equivalent answer is a second battery, which is usually far cheaper than the next machine up and doubles the working time immediately. Check that the model takes a removable pack before counting on it, because a good many do not.
Common questions
Is 20 minutes enough for 1400 square feet?
Not in one charge. It covers roughly 27 percent of the floor at a realistic pace, so expect either a recharge and resume cycle or a home split into zones that run on different days. Neither is a problem, they simply change how you schedule it.
Why is real coverage so much lower than the advertised figure?
Because the advertised figure is measured on open floor. A furnished room costs a machine a large share of its runtime in turning, repositioning, edge following and working around furniture legs, none of which covers new ground. Around 19 square feet a minute is the working figure this site plans with.
Does boost mode really cost that much runtime?
Roughly three to four times, yes. The same charge that gives 20 minutes in eco gives about 6 in boost, because the motor is drawing far more current for the whole period. Used in bursts on the rooms that need it, boost costs very little; left on for the whole house, it more or less guarantees the machine does not finish.
Should I buy more runtime or a self emptying base?
They solve different problems. Runtime decides whether the job finishes in one go, and a base decides how often you are personally involved. In townhouse or large apartment the bin is the more frequent interruption at roughly every 3 days, so if the runtime is already adequate the base is usually the upgrade owners say they would not give up.
Will the runtime get worse as the machine ages?
Yes, and that is normal rather than a fault. Lithium packs lose capacity both by cycle count and simply by ageing, so a machine delivering around eighty percent of its rated runtime after a few years is behaving as designed. Buying with some margin means that decline does not turn into the machine stranding itself halfway through the floor.
Every figure here comes from published manufacturer specifications, owner reported measurements and repair documentation, and each is labelled as either a standard or a convention. This is researched general information to help you diagnose and plan, not professional advice, and it cannot tell you what is wrong with one particular machine. Your own manual and the part number printed on your machine are the final word.