I hope people realize that a light year is a measure of distance, not a measure of time. That would be like saying something would take 50 miles to complete when what they mean is it would take the time it would take to travel 50 miles at maximum speed to complete.

I did some calculations and came up with this. The fastest man-made object in space was Helios 2, which traveled at around 150,000 Miles/Hour (after a sling-shot around Jupiter from what I understand). A light year is approximately 5,878,499,810,000 (almost 6 trillion) miles. At 150,000 Miles/Hour, to travel 17 light years would take approximately 76001 years, 152 days, 10 hours, 28 minutes.

Now of course, if the entire bank transaction transpired electronically, assuming the electromagnetic waves traveled steadily at the speed of light (approximately 186,282 Miles/Second), it would take approximately 17 years, 3 hours, 8 minutes for the signal to travel 17 light years.

Assuming the bank transaction required a receipt to be returned to the buyer in order to be considered “complete”, double the final times.