Total execution time and propagation delay

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There is no such thing as "hardware execution time".

You have no clock in your design, so the circuit will have a propogation delay as I described previously.

if you had a clock in the design, then you could calculate the latency.

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I would like to calculate the time required to execute this adder in hardware(FPGA) and in Nios ii. have you any proposition to do this??