Longer Tempo Run

Did a 12K tempo run at a 4:55 pace with a .5K cool down before work at midnight. I haven't ever done regular tempo runs with specific goals in mind. After doing some research I realize that this hasn't helped me in the speed department. Its probably too late to make a difference this year but it is something that I am definitely going to do going into the next season. In addition to my weekly 3 hour LSD I will start doing a 90 minute tempo run.