Using the standard plot time rule, a single astrogator can only work ten hours and take ten hours off between shifts (rest etc). Incorporating a second astrogator will allow the plot time to be cut nearly in half, as one works while the other rests. A third astrogator can cut this time down even further.
The formula for multiple-astrogator course plotting is as follows:
T = L x 10 / ( A - 1) + A
T is total plot time in GST hours
L is the number of light years to be travelled
A is the number of astrogators working together
Thus, an 8LY jump that would normally require 80 hours of time (not including downtime) for a single astrogator could be plotted by three astrogators in only 43 hours total time.