Total execution time and propagation delay

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This is not a execution time, this is the propogation delay through this circuit for this compilation in the worst case scenario. Next time you compile the code, this will change. Timequest is only meant to tell you if your design met the timing specs that you specified or if it missed. It is meant for synchronous designs only. Relying on propagation delays through the device is NOT reliable, as they will be affected by PVT (process voltage and temperature) ie. as the temperature changes, so will the propogation delay. To mitigate this you use a synchronous circuit, then you know what the register-register timing is, and timequest can tell you if your design can meet it.

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Thank you Tricky, you are right. If the "Total Propagation Delay" is not a "Hardware Execution Time", so how to calculate the "Hardware Execution Time" of my adder 4-bits.

The code of an adder 4-bits is attached.

Best Regards,