I predicted in another thread that the time trial trophies will be close to impossible solo. To make the gold medal times, I feel like you need both characters to constantly be on the move and playing solo you can only control one at a time. This will hands down be one of the rarest and most difficult platinums on the PS4 imo. I attempted the gold time on Hideaway 4-5 times. My best run had a few hiccups but was pretty smooth, yet I am 6 minutes off the pace. Unless some hidden shortcuts or such start appearing, I just don't see how the time trial times are possible playing solo.