What is the charging time difference between a 6ft charger and a 3 ft one?

So, as a "surprise" my iPad lightning charging cable has of course broken. As I am going to buy a new one I am considering a 6ft one over the regular 3ft one.

I have researched this slightly and most of the forums have answers in terms of voltage difference. However, I am interested in the time difference.

For example, if a 6ft charging cable will only charge from empty to full 30 mins or so slower than the 3ft then 6ft will be fine but of course if it takes an hour or so longer than the 3ft then 3ft will be chosen.

I hope at makes sense and thanks in advance!

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