Apparently they did 30 seconds in 2022:
https://www.newscientist.com/article/2336385-korean-nuclear-fusion-reactor-achieves-100-millionc-for-30-seconds/
Current: https://www.sciencealert.com/korean-fusion-reactor-sets-new-record-for-sustaining-100-million-degree-plasma
Wow. Well, as long as they keep it contained.
Something like that could cause real havoc bouncing down the street.