Final answer:
The methods section of a lab report should not include the specific length of time that absorbance was recorded with a spectrometer as this is more relevant to the results section.
Step-by-step explanation:
The item that should not be included in a methods section of a lab report concerning the use of a spectrometer is d) The amount of time absorbance was recorded. In the context of this experiment, when one records the measurements using a spectrometer, the emphasis is on the calibration procedure, the equipment details, such as the spectrometer model and manufacturer, and the measurements recorded. The specific length of time that absorbance is recorded is likely more pertinent to the results and discussion sections where the experimental observations are detailed rather than the methodology, which is intended to be a systematic and general guide for replicating the experiment.