That depends on how you purchase your backing tracks.
When you create an account on Broadwaytrax, you'll have access to all of your orders and purchased accompaniment tracks at any time - your download links will never expire. You can access your downloads at any time by simply logging in to your account.
If you decide to purchase as a guest, your download links will expire after 1 week. You will automatically be sent to your download page once your order is approved, and will be sent an email receipt after purchase containing your download link, which you can use to download your tracks until the links expire.
We recommend never having your download links expire -- just create a free Broadwaytrax.com account!