The ROI is annualized to account for the days out. As an example, say an invoice returned a 5% fee. (5% of the advance was earned as a fee) If that fee took 30 days to earn the ROI would be 5% * 365/30 = 60%. But if the fee took 60 days to be earned, the ROI would be 5% * 365/60 = 30%. Using this method the ROI takes into account both the fee earned as well as how long it took to be earned.
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