That's pretty reasonable imho. Probably took several days of back and forth to establish what they wanted. Then a day to knock up the script, generate the outpu

That's pretty reasonable imho. Probably took several days of back and forth to establish what they wanted. Then a day to knock up the script, generate the output. Now several more days of back and forth about whether it's what they really wanted. Pad a bit for the risk that they never pay, possibility of legal action in the future, etc.