NPH- Intermediate-Acting Insulin
NPH is an intermediate-acting insulin. Onset is 1-2 hours, peak is 4-12 hours, and duration is 18-24 hours.
HINT: Neil Patrick Harris (NPH) is a hard-working actor of intermediate height. If you call him, he will be "on set" in 1-2 hours and he will stay there for up to 24 hours.