That is difficult to say because it depends on many factors.
The following guidelines are available:

• The longer you fix the Gulden, the higher your earnings will be.
• The more Gulden you commit, the higher your earnings will be.
• The more Gulden are captured in total, the lower your earnings become.
• The more witness accounts are created, the lower your earnings become

When designing this function, it was assumed that the yield from a normal account would be between 2-10% per year. But in exceptional cases it can also become more or less.
There is a calculator that uses the real numbers to predict what your revenue will be. But realize that the situation can always change.  Here is the link to the calculator

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