FPGA calculation time vs modelsim simulation time

Hallo everyone,

if i have a function that calculate for example the square root of an integer. This function is simulated by using Modelsim, and the time required to receive the output result is approximately 1 ns (as an example).

is that mean, that the calculation time needs to implement this function in FPGA is also equal to 1 ns?

In other word, the time needs to get the output result after the input value is gave to this function.

PS: i am not using a clock in the function.

Thanks in advance.

Billel