It is designed like a hot air balloon, but it appears to have a sealed balloon. This is probably a helium balloon, which means you're going to have to wait for the helium to leak out.
Based on the art, I'd say it would last about as long as a normal latex filled helium balloon (it's bigger, so there's more in it, but also more surface area) so probably would take a day or two before it deflates enough to drop.
You can, you just kinda hope to not hit a thermal or strong winds. You have weighted balasts on all sides of the basket, by changing the weight distribution you can influence the direction of the floating. Influence, not fully control; iirc as long as wind is less than 5mph opposed to the direction you want to go, you'll be able to pick up speed in that direction.
A plane can be maneuvered. If the wind blows and you’re completely powerless because of it, you’re not maneuvering shit. A hot air balloon cannot be steered, is what I’m saying.
Climbing down the rope would do the job as well, considering it’s latched to the rim of the basket. Probably be fairly easy, too. Wrap shirt around hands, clamp feet to rope (one above the other so the rope rests between your shoes, which then functions as a brake to slow your slide), and slide down.