how long does it last for regular insulin work
It depends on which insulin to use. There are 3 kinds. Regular insulin has an onset of action (begins to reduce blood sugar) within 30 minutes of injection, reaches a peak effect at 1-3 hours, and has effects that last 6-8 hours. NPH insulin is an insulin with an intermediate duration of action. It has an onset of action starting about 2 hours following injection.