how much calibration data does a spectrograph need?

There was an SDSS-V operational telecon today, in which we discussed the plans for the first year of data, and how those plans should depend on, or be conditional on, what we learn in the commissioning phase. One of the most important things about SDSS-V is that it is robotic and fiber-fed, so we can move fast and do time domain things. But how fast? This depends, in turn, on how much calibration data we need as a function of time. I proposed that we could ask how well we can synthesize calibration data in one telescope configuration at one time, given calibration data from other telescope configurations at other times. This is not unlike the approach we took to calibrating EXPRES. So of course it was put back to me: Design the experiments that will answer this question! The main issue is that the BOSS spectrogaphs hang off the back of the pointing, tracking telescope.