30 CFR §203.52

1. (a)To qualify for relief, you must demonstrate that the sum of royalty payments over the 12 qualifying months exceeds 75 percent of the sum of net revenues (before-royalty revenues minus allowable costs, as defined in § 203.84).
2. (b)To re-qualify for relief, e.g., either applying for additional relief on top of relief already granted, or applying for relief sometime after your earlier agreement terminated, you must demonstrate that:
   1. (1)You have met the criterion listed in paragraph (a) of this section, and
   2. (2)The 12 required qualifying months of operation have occurred under the current royalty arrangement.