The last 25 years of my life, I have had to use a BASAL/24 Hour Long Acting Insulin along with a before Meal-Time/Fast Acting Insulin. This is most, but not inherently, due to wearing an insulin pump.
The 35 years before that, I used syringes twice a day. I am dependent on insulin. I am an insulin addict.
The following guide and charts will be of good use to you, the T1D and or T2Ds in need of insulin.
Please use this with your doctor(s).