I've done this for virtually every game since I bought a 360, and it's the second reason I went with the old elite (the other, main reason, being that it was black, like 99% of the tech I've ever owned, sadly) and the 250gb Slim when that died.
It's just a normal part of gaming to me now. And gives you time to prepare for a long gaming session. Get it installing, then go to the loo, make a cup of tea, have a snack, make sure anything you'll need to do around the house is out of the way, maybe fix yourself a brandy or gin and tonic if it's a particularly fine game, and by then you're ready to go, without the worries of later interruptions.
Also, the entire experience of playing is vastly improved, so it's more than worth the ten minute delay.