In my life, I've thrown two of these that I tracked with my eyes for 5+ minutes that never came down.

First was from ground level but in a downtown area. It caught the currents between the tall buildings and just kept going and I lost it after it crossed a street and I couldn't cross fast enough to follow.

Second was from a 19th floor balcony. The two other paper plane designs my friends used fell to the ground in less than a minute. Mine reached about the 4th floor, caught an updraft from the hot asphalt streets, and never came down. It flew so high that it became a dot and eventually wasn't visible.

Cliffs: this design is great for gliding and catching air currents, and will fly forever if it catches the right one. Throw outdoors for great fun.

small

is LEDs, not LED's.