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Insulin Preparation Onset of Action Peak Action (hours) Duration of Action (hours) Lispro 5 to 15 minutes 1 to 2 3 to 4 Aspart 5 to 15 minutes 1 to 2 3 to 4 Regular 30 to 60 minutes 2 to 4 6 to 8 NPH 1 to 3 hours 5 to 7 13 to 16 Lente 1 to 3 hours 4 to 8 13 to 20 Ultralente 2 to 4 hours 8 to 14 <20 Glargine 2 to 4 hours Flat >24 NPH, neutral protamine Hagedorn.