A thermite reaction is almost instant. Here they burn through 500 grams of thermite in like 2-3 seconds.
Note how in the second video they have to fly very low and it's hardly reaching the ground below
So what hohols use in some videos is likely not thermite but sparkler powder used in fireworks, which is a mix of titanium, aluminum, iron oxide, saltpeter, charcoal, magnesium, and sulphur. It's much easier to ignite, since it has a much lower ignition temperature of ~500°С.
Note how in the second video they have to fly very low and it's hardly reaching the ground below
So what hohols use in some videos is likely not thermite but sparkler powder used in fireworks, which is a mix of titanium, aluminum, iron oxide, saltpeter, charcoal, magnesium, and sulphur. It's much easier to ignite, since it has a much lower ignition temperature of ~500°С.