Just finished my hardmode playthrough on PS4. Took me exactly 6 hours, but I let all dialogue and cutscenes fully play out (so I´d guess you can speedrun hard mode in about 5 hours) and didn´t do some extra stuff.
Now on to trophy hunting!
One gripe though, wouldn´t the eyedrops have taken away for no reason from Agent Ray after she left town I would also have the crying achievement now. I still need to do easy mode without picking up dust and still need to do a few answering machine messages.
Bohooo, this sounds like you already got the crying achievements 
6 hours without aborting any dialog? Didn’t think this was possible, but I’m someone who always tries all dialog options.
Speedrun should be possible much faster though… and I here is that old thread:
Yes, there is a lot you can do in the game without officially asking why you have to do that first. A rare case is when you can´t give your watch to Willie without talking to him and him mentioning that he repairs watches.
Just finished my casual playthrough on the PS4. Time: 92 minutes (skipping dialog and cutscenes where possible).
Now for the answering machine messages to get the remaining 2 trophies…
It´s finally done! 100% of trophies on the PS4! Took me about 7 1/2 in total. Revisting the game with new controls and on a bigger screen was good fun!
Now I feel empty inside. 
Mobile?
Yeah, but I kinda enjoyed how it looked on my TV because my TV is quite a bit bigger than my computer monitor. So it was nice to see the graphics bigger than ever before(dunno if I´d really want to go back to a really tiny screen).
Sure would have done better at those “spot the thing” games than a week ago.