Change 3 poing time to real time

So I'm tryna get better at 3s in live run so I asked a couple friends and they told me to go into the one solo shooter thing. When i went in it was way to easy and I could not compare them to each other and if I were to "practice" it would make qe worse of a player not a better one. So I was wondering if I can change the timing to normal time like in live run not that weak * stuff in league etc. Thanks brothas and sisters