How long does it take to get Platinum?
To determine on how hard a game is, looking at the type of Platinum and % gives you a good indication. But there is another dimension to this aswell and it's how much time does it take to earn the Platinum. At a first glance two games might have the same Platinum type and %, but one game might take 30h to get the Platinum and the other 60h. That is quite a big difference.
So I usually use www.howlongtobeat.com and look at the Complete Median time for a game. This combine with Platinum type and %, gives me a good indication when it’s a good time to play this game depending on the release calendar for games I am looking forward to.
I always contribute to the community and adds the number of hours it took me to get 100%! Strongly recommend you add you numbers there!