How long will 30mg timed-release morphine sulfate remain in your system?

12 hours for the long-acting M-Eslon; 4-6 hours for the short-acting M-Ir (Immediate release). The long-acting morphine is usually a capsule with little 'beads' inside (though it can also be a capsule-shaped tablet), where the short-acting is usually a pill (white for generic, purple stamped '30' for name brand -- the morphine is the same in both though).