He uses 11 buckets to fill his bath normally because 14 - 3 = <<14-3=11>>11
He uses 1, 320 ounces a day for his baths because 11 x 120 = <<11*120=1320>>1,320
He uses 9, 240 ounces a week for his baths because 7 x 1,320 = <<7*1320=9240>>9,240
#### 9,240