I'm sitting around waiting on the 2020 CPU revision of the 16" MBP. Will be getting that top GPU too. Just don't want to buy right now if we might get that CPU upgrade in the next 1-3 months.
I think this is every Apple Intel platform. My i7 6-core Mini can manage about 30 seconds at full clock if they're all lit. One problem seems to be that the fan hysteresis is too long, it spins up the fan too slowly and the CPU is already throttling down before it reaches full airflow.