Feels good to earn that trophy isn't it. I think I tried for that one for about 2 hours before I managed to get it. And I think only just barely got it too. (no way to really tell for sure). Feel free to add me to your PSN friends list. ^_~
Sorry, I meant your TIME, actually.. I wish it would somehow accurately tell you your completion time besides awarding you the trophy. When I finally earned it, I desperately wanted to know what the actual time I managed to achieve.
D'oh.. Well, if you're anything like me, the time achieved is less important than earning the trophy for it. and I have all but 2 of the trophies as we pretty much played the entire game of Portal 2 together (besides the single player story mode, obviously). Only 2 more co-op trophies to earn and we each get the platinum. ^_^
*Demonysh and I nearly got that one, one night.. We got all the way to the end of the final test of course 4 and we made 1 tiny mistake.. >_< We'll try again soon.. It's do-able I'm sure.. It just takes a lot of patience, and practise from both partners. ^_^
hahaha there's a trophy called "overclocker" where you have to beat test chamber 10 in chapter 3 in under 70 seconds. This required me re-playing the same level over and over and over again and listening to her repeat herself over and over haha