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For faint targets(I magnitude ≤9.0), GPI is expected to achieve 5-σ sensitivity at H=21 in one hour in spectroscopic mode. Achieved sensitivity is a function of many parameters, including contrast, inner working distance, brightness of the central star (if any), observing mode (dithered, sky-offset, sky-rotation) and it is not yet possible to provide estimates for all modes. Further details will be made available upon commissioning, but for the purposes of PIs generating proposals for Campaign observing, please assume that you will require a typical observation of at least 1 hour on each science target, irrespective of filter. If you believe that your programme will require significantly more or significantly less than this per target, please state so clearly in your proposal and contact the instrument scientist to confirm that the estimate is appropriate.