Context.

"was on the road for 10 hours" includes stops.

"It's a straight 10 hour drive to Boston" does not include stops.

I usually say something like “10 hours, plus stops,” to avoid confusion.

I never realized how different people take this. For me it's a definite no. A 10 hour drive is how long it takes without breaks, because it makes no sense to have it included, since everyone's breaks would vary in length.

If I'm telling someone else how long a drive will be, I tell them the drive time without stops. If I'm telling someone how long a drive is/was for me personally, I'll include time for stops and note how many times I stopped along the way, for context

Not if you're my dad.

People are not usually counting that, but it’s not as if it’s a standard. Sometimes they mean how long the overall trip takes, other times, simply the distance divided by the average speed limit.

As an Australian, not an American, we drive long distances too. We express in km/h and km, not mph and miles. Due to high risks of sleeping on long straight empty roads, rest breaks are taken seriously here. I’d consider a 10 hour drive as door to door including minimal breaks. It would be foolhardy to drive without breaks. However, if I was describing the distance without breaks, I’d say that. If I was taking longer breaks, I’d say it too, for clarity.

My in laws live near the border of the next state. It’s a 6 hour drive without stopping. I’d describe it as a 7 hour drive, door to door. We have done it in 9 hours with stops in playgrounds for the kids. If I was describing that I’d still describe it as a 7 hour drive that we took extra breaks, so it took 9.

The time is usually an estimate, or the best case scenario in my head. If I have to stop and add more time, I do. But 10 hours is probably what google maps told me it is. I drove straight 9 hours or so once, I think I stopped twice to use the bathroom/get a snack. Got there at 2am. It was rough, wouldn't do it again.

Generally you stop every 2-4 hours to stretch your legs, go to the bathroom, get fuel, etc.

So if Google Maps says a drive takes 10 hours, I would factor at least another 1.5 hours for stops and a meal somewhere along the way. So 11.5 hours or so if you don't stay stopped too long. 0 miles per hour brings the average down quickly.

12 parsecs

It usually doesn’t include breaks but it’s also never expected to be used as anything other than an approximation.

Just depends on the person saying it. Could just be what their GPS says or the person could have included stops. Best to ask them as there is no definitive answer to this.

It's going to take all day either way with or without stops. You'll have to eat either before, during or after the drive.

To me, anything more than 4 hours is a 1 day drive.

If someone said 10 hour drive, I'd assume that's the time on the road without stops. The context being not about distance anymore, but about for long you're going to sit in a car, to plan for breaks, hotels and splitting the drive.

Also flights. A two hour flight is from start to landing, even if the entire thing also includes two hours before checking in and half an hour to collect the luggage and finding a taxi out of there etc. The 2 hour is only for making the decision of when to eat and what to bring on board. Same thing with long drives.

Both breaks and driving speed included. I mean "how long it will take me to drive" and it's usually based on however long it took me last time I drove it.

For example, to visit my childhood home from where I live now is a ten-anna-half hour drive if my father does it, and a nine hour drive if my brother does it.

The 7 hour drive I had last week included one stop for gas, but that's it. We usually refer to the amount of time the gps says it will take.

To me, it includes breaks to refuel and use the restroom, and if it's more than maybe 6 hours, will factor in the time to scarf down a fast-food meal. Also, any time this discussion involves "X hours" it's undoubtedly being rounded and estimated, and it will involve a hundred different little variables like traffic, road construction, the driver's tolerance for speeding a bit, etc. Also, don't forget that it's common, but not formal, so there's no single way people are taught, and different contexts will require different levels of accuracy.

Depends on the person. If me and my mother are talking about going to and from the same location, I may say it is an 18 hour drive because I only stop for fuel and quick pee breaks. My mother would say its a 24-25 hour drive because she drives slower and takes longer/more frequent breaks

American here that does long haul drives rather frequently for dog shows..

When I give a time, it's without breaks. "10 hours to the Fairgrounds" - 10 hours of straight driving with no problems.

I tell folks new to my methodology to anticipate around an hour of variance for every twelve hours, as I typically must stop 2x for gas at least. (My tank holds 400 miles / 12 gallons, and I try not to let it drop below 50 / 1.5 gallons.)

For the dog shows, I've got a varying number of dogs with me (8 was my max, 2-4 pretty common) and pottying them takes forever.

Edit for Clarification: I'm content to drive around 14-16 hours straight without stopping to rest. If the trip is longer than that, I do have to pull over to nap.

I always speak in drive time and i will note total time when applicable.

For example: drove my ex to DK. I drove like 9.5 hours overnight. Lol We probably stopped for an hour and a half or so total like ~11 hours.

Personally, that includes gas station stops, but not much beyond that.

It depends on the distance, or how it was expressed. Less than 12 hours, or exact times, probably means just the actual driving time before any stops. Really long spans of time, or when someone says something fuzzy like "a half-day drive," you can probably assume are accounting for a break or two.

To answer your specific question, if someone said "a 10 hour drive" to me, I would assume they meant 10 actual road hours, before breaks. I would anticipate their actual arrival in an 11 to 12 hour time frame.

Mental. I start seeing sounds after 5-6 hours straight driving.

I'd say it does as driving for 10 hours straight without any stops doesn't really sound healthy.

I usually refer to GPS time.

Sure, but there are far fewer breaks than there should be, generally.

In general conversation, no. We wouldn't say that Hoiston is X miles from Dallas, we'd just say about 4 hours. Same with distance between Fort Worth and Dallas, we use time to convey distance.

It makes things easier for planning purposes to use drive time. We even say "drivetime" because that's how long it takes to drive to the destination, whether that's down the street to the store or a city across the state. It's just like when you put in a destination on a GPS, it shows how long it'll take to drive there, nothing more.