Your car should be OK sitting for two weeks. There is some drain for the security system. But it should be much less than the total capacity of the battery, if the battery is OK.
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Don't let your vehicle sit idle for more than two weeks - at least get your vehicle started and get it running for a while. You'll end up saving yourself time and money on repairs, and you'll ensure that your vehicle is ready to go once you need it again.
Typically, your car can sit about four weeks to two months without driving before the battery dies. The reason your car can sit only for so long before it dies is the fact that your car battery is in use even when you're not behind the wheel.
There is no straightforward answer to this, as it depends on how well you prepare your car for storage and how often you maintain it. Generally speaking, you don't want to leave your car untouched for more than two weeks. Store it for less time than that if you're especially concerned about your battery draining.