Paris to Lyon is a similar (slightly shorter) distance and done in 1:53 (average 208 kph). Beijing to Zhengzhou is slightly further and takes 2:24 (average 304 kph). These are best cases running directly along the high-speed line, but presumably the direct LA-SF service will be one of those too.

Edit: the closest comparison distance-wise is probably Barcelona to Madrid; 2:45, average 227kph.