I need help

Figure 2.3 shows the relationship between key length and the amount of time required

for a brute-force attack assuming a certain number of attempts per microsecond.

Use the graph to estimate the amount of time for such an attack against AES with a 192-bit

key, state your result in words, and briefly explain the process you used.

Figure 2.3 Time to Break a Code (assuming 106 decryptions(us)