Hi. I am new here. I have had diabetes for several years now, but have just started on insulin three days ago. Up until then I was taking oral meds like metformin and Januvia and Actos UGH! I am taking Levemir and Novolog. 28 units of Levemir at bedtime, and Novolog before meals, 8,8,12. How long does it take for this insulin to get in your system? Is it immediate, or does it take days to work? I seem to feel better, but my numbers aren't coming down any.