; (II) on a regular continuous, and substantial basis; and (III) for, with respect to a crop year, a period of at least— (aa) 500 hours; or (bb) 50 percent of the total management hours required for that farming operation on an annual basis, as determined by the Corporation. . 6. Maximum amount of additional prevented planting coverage Section 508(h)(6) of the Agricultural Adjustment Act of 1938 ( 7 U.S.C. 1508(h)(6) ) is amended by adding at the end the following: (D) Maximum amount of coverage A crop loss of a producer may only be covered by the additional prevented planting coverage if, during the 3-year period preceding such loss, such producer had less than or equal to 2 crop losses covered by the additional prevented planting coverage. . 7. Premium reduction Section 508(i) of the Agricultural Adjustment Act of 1938 ( 7 U.S.C. 1508(i) ) is amended by adding at the end the following: (5) Premium reduction If the Corporation makes a determination that a producer has received 3 or more indemnities under a plan of insurance for the same type of loss during a 4-year period, the Corporation shall, with respect to such producer, reduce the premium rate of such plan by 15 percent (except in no case may such premium rate be less than zero). . 8. Cap on overall rate of return for crop insurance providers Section 508(k)(3) of the Federal Crop Insurance Act ( 7 U.S.C. 1508(k)(3) ) is amended— (1) by striking the paragraph designation and heading and all that follows through The and inserting the following: (3) Risk (A) Share of risk The