it's quality not quantity of your attention that counts. They emphasised it's far more important to pay attention and respond to your child many times throughout the day - usually only for a few minutes each time - than it is to have a big lump of time together.
LOL - exactly the same thought.. yet I've heard that described more as quantity time, not quality time. Geez they like to confuse us don't they?! Perhaps it's a difference in the definition of "quantity".

ETA: eg. you're better off being there for them all day on Saturday, and interacting with them throughout that whole day, and they know you're there when they need you (quantity time = all day) than to say "i'll spend quality time with the kids between 11 & 12 on Saturday".