Fastest Hard on Record

One time I wanted to see how quickly I could get a full hard on. I pulled down my pants when I was completely soft and began to have erotic thoughts while watching it and timing with my watch. I could see the individual heart beats as it pumped up, boom, boom, boom.... 45 seconds total elapsed time and standing up at a 45% angle, hard as a rock. I was about 18 at the time.