As I demonstrated above, when I multiplied by 4 rather than 8, numbers are not my strength. Fortunately, I do not use numbers at work! However, using the standard of 7-9ml (of 200 IMCU rennet) per 100 # milk, my engineer husband tells me that comes out to about .7ml per 1 gallon (8.6#) or 1.5 ml for 2 gallons. That seems a very small amount of rennet at even at 280 IMCU! I feel a little afraid that my milk will not curd.... So if on my first batch, the flocculation is very long, what do I do to not waste the milk?