Even though you can not estimate exactly, but you can estimate the execution time efforts depending on the Function Points in your Test Cases.
You will have to categorize your test cases in 3 different categories e.g. Critical / Major / Minor and then can check timing for 5 test cases from each group. Take average of that and multiply with number of test cases in respective groups.
This will not give you exact estimate, but it will definitely give estimate near to actual time.
I have tried this in my past projects and could successfully delviered my product within given time frame.
I will also recommend to add 10 to 15 % extra time, so that if you get stuck some where or considering some obstacles in testing, you can deliver product within your estimated time.
Test Execution Estimates
Labels: Test Execution Estimates
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I am sorry to tell u this. But in the real time scenarios, test estimation is done before the test case creation. So u can never come to know the exact number of test cases that we would design and hence cannot execute the case for the same.
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