Average seasoning period for Commercial Loan refi.

I have slowly built a portfolio of 23 SFHs in West Florida. After obtaining a spreader loan (basically a blanket Loan) I continued to buy properties cash or hard money. When applying to add the new purchases to my spreader loan (promised that I could during the original courtship by the lender) they broke it to me that average seasoning for "commercial cash-out/refinance deals" was a minimum of 24 months before appraised value can be borrowed against. This limits me to the 70% of the purchase price, not the appraised value (ARV). This 24 month seasoning was quoted as "industry standard" in which I am skeptical. Does anyone else have knowledge of this "standard"?