I would think you would be in for at least 5-6-20 foot rolls or more.
You are supposed to overlap it as you wrap so, yea.
One wrap on a 1.5 tube is about 4.5 inches so overlapped an inch on each wrap would be one wrap per inch.
A four foot section of 8 tubes would be 48 wraps X 4.5 X 8 tubes just for the 8 tubes not counting collectors.
Keep in mind it would end up two layers thick doing it this way.