FWIW I am diabetic so I am somewhat more familiar with insulin than the average Joe.
To give you an idea, I take about 12 units total insulin per day when on a 2000 calorie cutting diet versus about 26 units on a 3000 calorie slow bulking diet.
Also, a 'spike' is subjective. It generally refers to a tall peak with a narrow base. IMO attempting to define this just leads to misconceptions.