you need to set it up on the conditions menu for thew 10 seconds part. To have it appear/disappear when useable/unuseable (instead of fading out) it's an option on the first menu. Sorry I can't be more specific, just woke up :P
If you want it to appear when 10 seconds are remaining. Look at that screenshot of FruitBat, there's a "Duration Requirements" option in there. Check "Maximum" and put 10 as value, leave "Opacity when failed" at 0%.