If it helps, I did 6x 10 Dice rolls, and I either got 60 or 65 points.
Assuming that's the average, every 10 Dice gets about 1 Cursed Hidan Frag. So that's 200 coupons per frag. So 80 Dice is 16,000 coupons. Minus the 14 free dice, that's about 15,800 coupons. But give and take your luck, I'd say between 15,000 to 17,000 to get him from 0 to 80 frags.
There will be people coming after me saying it only took 14,000 or 13,000 or all 18,000 and what not. Its all completely possible. This figure was just my own opinion. ;P