Although orange juice from a carton should last for a week, freshly squeezed juice won't keep so long. If you press orange juice by hand, with a citrus press or masticating juicer, it should keep for 2 or 3 days.  If you used a centrifugal juicer you should drink it within 24 hours. This is because centrifugal juicers use a spinning blade that heats up the orange juice and shortens its shelf life.