Calculate the time of hash cracking

calc_cracking_time.py

# Use the MD5 GPU hash rate from the GPU benchmark of this section 
# and calculate the cracking time in minutes with the following conditions. 
# Use a charset of all lower and upper case letters of the English alphabet 
# and use a password length of 8. Enter the answer as full minutes without seconds.

charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
passw_length = 8

# hashcat -b
hash_rate = 681851 * 100000  # hash rate for MD5 GPU from the benchmark

keyspace = (len(charset) ** passw_length)

crack_speed_sec = keyspace / hash_rate

crack_speed_min = crack_speed_sec / 60

print(crack_speed_min)