The phantom motors are brushless motors and are not toy grade motors so they are going to last a long time.
The other two here have already told how you can prevent burning your ESC by basically making sure your motors never get obstructed. There might be a short circuit prevention but don't use that as an excuse to try anything.
But what you really want to look out for, is if you just happen to get a bad ESC unit. My standard was a victim of it. Even if you are a perfect pilot, from the day I opened my standard, not once did I crash it, not once did I mess with the motors while turned on, on my 29th flight, it dropped out of the sky like a rock and landed in a tree. It doesn't matter how well you treat your bird, there is still a chance that your ESC will fail without warning.
Don't let that scare you though, I was just one of the unlucky few to have it happen. But I would recommend for your first 30 flights or so, do not fly anywhere you could not retrieve your phantom. Do not fly it half a mile over the forest or go filming boats on the water for your first flights. Mine landed 30 feet in a tree so with a really long stick, i knocked it out and DJI repaired it under warranty.