The datasheet and ref manual only mention that the conversion time is 1.2 us but this is not enough to find the sample rate. All other stm32 products mention that explicitly, why not this one?
This does not agree with the conversion rate. If it takes 1.2 us to convert, then the max sample rate would be 1/1.2 us which is 833 khz. The DS mentions 1 MHz.