Ok, so I decided to do some math on this because I'm a math nerd.
(Assuming you use Ortega)
Making 5 turns in 0.45 seconds means you did 5/0.45=11.1 tps(ignoring pickup and drop times). According to the speedsolving.com wiki, the average number of turns for Ortega is around 20. You said you averaged 6 seconds, and I would assume that for you OLL and PBL recognition combined takes about 1.5 seconds. That gives 4.5 seconds of actual turning time, which means your tps during normal solves is about 20/4.5=4.4.
Now, getting 4.4 tps for normal algs while getting 11 for this solve is pretty unlikely, especially considering I ignored the pickup and drop times, which would make the tps requirement even higher.
I'm not saying you 100% cheated. As Jorian Meeuse pointed out, It's possible that you did an illegal timer start or stop, but even in that case, it's pretty unlikely that this time is legit.