Two and a half hours out, four hours of walking, and long stretches of wall with nobody else on it.

Jinshanling sits about 130 km from Beijing, roughly two and a half hours by road. That extra hour buys you three things the famous sections cannot: long empty ridges, a wall that is only partly rebuilt, and the sense that you are walking on something rather than queuing at it.
It is not for everyone. If you have half a day and want the classic photo, go to Mutianyu. If you have a full day, decent shoes, and a preference for views over convenience, Jinshanling is the section people remember years later.
The classic route runs from the east end towards the west, mostly downhill, and takes about four hours at a relaxed pace with photography stops. A short cable car covers the initial climb at some entry points. The full traverse of the open section is roughly 5–10 km depending on how far you go.
Harder than Mutianyu, easier than Jiankou. Expect steep stair sections, long ramps at 30–40 degrees, uneven brick, and exposed ridgeline with no shade. There is very little in the way of railings. If you can walk four hours over hilly ground with a daypack, you can do the standard route.
The section is genuinely not suitable if you have knee problems, a fear of heights, or young children who need constant supervision near unguarded drops.
There is no train station at Jinshanling. It is a road trip: private car, hired driver, or a companion day. Expect about 2.5 hours each way from central Beijing, longer in holiday traffic. Because of the drive and the walking, this is a genuinely full day — 9–11 hours door to door.
Practical detail worth knowing: ride-hailing coverage at Jinshanling is thinner even than at Mutianyu. A car that waits is not a luxury here, it is the plan. Full options in how to get to the Great Wall.
More than at any other section. The drive is long, there is no public transport, the return leg needs arranging, and the route has choices to make — where to start, how far to go, which towers have the best light. A companion handles all of that and adds the history: how the wall was garrisoned, why the towers are spaced as they are, and what you are looking at across the valleys.
It is about 130 km north-east of Beijing, roughly two and a half hours by road. There is no train station, so a car or private day is the only practical option.
The classic east-to-west route is roughly 5-10 km and takes about four hours at a relaxed pace. A short version using the cable car can be done in two to three hours.
Yes. Expect steeper ramps, uneven brick, un-restored stretches and no shade. It is manageable for anyone comfortable with four hours of hilly walking, but it is a step up from Mutianyu.
Far less than Badaling or Mutianyu. Even on busy weekends you will find long stretches with very few people; on a weekday in low season it can feel almost empty.
Yes, and it is spectacular with snow. Dress warmly for wind on the ridge and check that the section is open before you drive out.
Basic: toilets and a few vendors near the entrances. Along the wall itself there is very little, so carry your own water and food.
For older children who can walk several hours, yes. For young children it is not ideal: there are unguarded drops and no railings on much of the route.
Jinshanling is restored to a walkable standard and open to visitors. Jiankou is un-restored, crumbling and genuinely dangerous. Do the former, look at photos of the latter.