Inquiring minds want to know…
It depends on speed, but 50% of the earth's atmosphere is below 18,000 feet.
>13614086
It should start heating up at 140,000 and as it descends the frictional rate will increase. At 80,000 - 100,000 it will be quite substantial.
The numbers I gave are in feet. I'm not sure of the current altitude of the rocket, since I'm not watching it.
It should start getting hot soon. Especially if the entry angle is not controlled.