You guys ever try this site? http://www.aimbooster.com/
The last few days I've been doing the Training and going with the sniping modes default settings.
Post your scores, I'm going to post mine later on, but I'll just say the first day I tried the sniper one my high score was ~45 seconds after about 10-15 tries. But since then I've gotten higher scores which I'll post later on.
Also feel free to also post your score for the default Challenge mode. I personally didn't enjoy this mode as much as the sniper mode as its more about flicking and less about tracking.
TIP: If your windows mouse sense is quite different from your in game, might want to temporarily adjust your DPI so it feels similar to your in game.