When I read that the conversion clock of an ADC is for example 2 MHz. Does it mean that the ADC perform the analog to digital conversion of n-bit every T=1/2MHZ=0.5 micro second?

This is what is written in the text: With a 2-MHz conversion clock, the ADC can perform an 8-bit single conversion in 6 μs or a 10-bit single conversion
in 7 μs.

I do not understand how these micro second times are derived.