The Appalachian Trail stretches 161 miles in the state of New Hampshire, how long it would take you to hike that far depends on a lot of factors. The trail in New Hampshire is fairly difficult so depending on your level of experience you could hike anywhere between 5 and 9 miles per day, so it could take anywhere from 17 to 33 days to hike all the way through.

You would use meters.

Or, if the trail is more than 1000 meters, you can use killometers

Depends on how you count walking paths as separate trails. Rather than arguing over the number of trails, note that there are over 700 miles of designated trails in the Park; and many of them are as stunningly beautiful as anywhere in the USA.

Cairns, ducks or duckies

The Continental Divide Trail. It follows the continental divide in the Rocky Mountains for approximately 3,000 miles from Canada to Mexico.

This is really a moot point, but here we go anyway.

Hiking trails draw tourist dollars to the communities through which they run. Tourist dollars equal spending that directly affects taxes collected (sales taxes) that would not normally be available; it is excess to the local tax base. Using tax dollars on hiking trails creates jobs, increases revenue for local businesses, and generates taxes to replace what has been used to build and maintain the trails.

It is an investment with return, not a deficit.

20 min (10.0 mi) via A547

You would be in either Arizona, California or in the state of Sonora or Baja California in Mexico.

it all varies with how fast you walk/"hike".

Hiking trail can be translated as "sendero de montaña"

Someone answered: "Your dog probable can go with you as long as he has the right equipment for his feet, and food and water."

But there's much more to it than that. If you are talking about a dayhike, then the answer is yes, but the dog should be leashed to prevent problems with wildlife. You wouldn't want to have the dog go after a snake and be bitten, or after a porcupine and get quills in its nose.

If you're talking about backpacking a long distance, or thruhiking the Trail, then there are a LOT more considerations. The Appalachian Trail Conservancy has the answers you need on their website at: http://www.appalachiantrail.org/site/c.mqLTIYOwGlF/b.4805495/k.9C34/Hiking_with_Dogs.htm Please take a look at that.

Kings Peak is the highpoint of Utah. It is the seventh highest of the U.S. State Highpoints and located approximately 42 miles north of Duchesne in the High Uintas Wilderness Area of the Ashley and Wasatch National Forests. The mountain was named after Clarence King, who was the first director of the US Geological Survey. The standard hiking route is a 28.8 mile round trip trek, so the peak is usually climbed as part of a backpacking trip.

There aren't. More or less anyone fit enough can walk to Everest Base Camp, but the mountain itself is the realm of the skilled, experienced and fully-equipped mountaineer.