This doesn't work for me but maybe I'm not using the correct steamID...I've noticed that my "login" name is different than what appears in the top right corner of my steam client. Also, your service may be overloaded without it saying so.

In any case, I looked at my list of games and play time on the Steam Client (on Mac) for the first time. It doesn't appear to be sorting correctly at all...for example, when sorting by "Playtime", the top listed game has "48.4 hrs on record" and then the next game is listed as "0.7"...and then the next game is "69.9" hours...It's kind of astounding to me how Steam is such a wonky, buggy platform given Valve's expertise.

Also, I really doubt that I've played Portal 2 for 70 hours. I guess it counts the time that I've left it minimized on the desktop. Though I admit, I am stuck on one of the latter puzzles and haven't gotten back to it...