Well time is certainly relative, but when I'm curious what the trophy I just got means, it multiplies how long it feels by roughly 1500%
If it's taking that long - just click-on "trophies", then on the game you're playing, highlight the trophy in question, and press triangle, then "Info" (to find out what the trophy is).
If your ISP is *that* slow - switch your trophy settings to "off-line" -and- as soon as your trophy pops you can see what it is!
Personally, I always keep it set to off-line & just let em sych overnight (before PS+, I used to just sign-in & synch em once a day (when I was done playing)).