The main slackline in the flybold Slackline Kit is about 57 feet long, according to the manufacturer's description. That should give you plenty of room to practice whether you're in your backyard or at a park.
The kit comes with a bunch of extra stuff to help you get started, like a training line, twin ratchets for tightening, arm trainers, ratchet protectors, and tree protectors. There's also a carry bag so you can take it anywhere.
From what we've found, a lot of people say setting it up is pretty simple—some managed in just 10 minutes. The instructions are generally helpful, but a few folks thought they could use a bit more detail, so checking out some online videos might be a good idea if you get stuck.
When you're getting it set up, you'll want to adjust the slackline based on how far apart your anchor points are, making sure it's nice and tight. Some people find the tensioning process with the ratchets straightforward, but others have had a bit of trouble if the ratchets don't have extra grips. A tool can help if you run into any snags.
Overall, people seem to be pretty happy with how it all comes together, and it seems to work well for both newbies and those who've been slacklining for a while.
It looks like this kit should give you a good time outdoors!