R&B Usage Ratio definition
R&B Usage Ratio means, from time to time, a fraction (expressed as a percentage) the numerator of which is the maximum number of days during which R&B Falcon Drilling (International & Deepwater) Inc. is obligated, pursuant to the terms of the Rig Sharing Agreement, to use the Drillship commencing on the most recent Adjustment Date preceding the date the rate of the Certificate Margin is to be determined and ending on the scheduled termination of the Drilling Contracts divided by the total number of days remaining during such period under the Drilling Contracts.