Interview Question - Scan Test

A 1.2GHz chip has scan chains of length 30,000 bits, 20,000 bits, 24,000 bits, 25,000 bits, and two of 12,000 bits. 500,000 test vectors are used for each scan chain. The tests are run at 50% of full speed.

What is the total test time?
Sol: 20.8 Secs