Adding time for dd to test and analyse read and write performance

This is an extension of a previous blog entry Using dd to test and analyse read and write performance. If you add time to dd

# time dd if=/dev/zero of=/home/myaccount/outfile bs=4M count=4096

4096+0 records in
4096+0 records out
17179869184 bytes (17 GB) copied, 136.832 seconds, 126 MB/s
real    2m16.834s
user    0m0.017s
sys     0m12.670s