Even the instantaneous coverage of ALMA is excellent and thus it is not expected that many projects will have issues reaching the requested sensitivity due to dynamic range issues. This is most likely to be a problem for complicated sources with large structures for which the sensitivity requirement is not that demanding, leading to small on-source integration times. If it is felt that more time is required than implied by the sensitivity alone, then it is possible to override the sensitivity-based time with a user-entered estimate. This should be time required for the most-extended 12-m configuration, including calibration and overheads. If other configurations and arrays are required, the OT will calculate the times for these in the same way as if the 12-m time had been calculated from the sensitivity. Why a user-defined override is necessary must also be rigorously justified in the Technical Justification node and a detailed description of the user-defined time estimate given.