Man, I'm wiped out. I just masturbated for a consecutive 15 hours
Why did you feel to need to masturbate for 15 hours?
No reason really.
I know it sounds like fun, but sitting around masturbating all day is unhealthy and can lead to bad habits.
I'm okay. I like doing this because it helps me to stay focused.
You didn't leave much time to focus on anything else did you. Seriously, it's normal to masturbate once in a while, but you shouldn't spend all of your time doing it. Maybe look for something more productive to do.