First, we should calculate the length in millimeters for the blueprint for each 1 meter.
33 ÷ 8 = 4.125
So, each 1 meter represents 4.125 mm on the blueprint.
Now, we can use this rate to calculate the length of blueprint if the length in real life is 6 meters. Multiply the actual length by the rate.
6 x 4.125
=24.75mm
Therefore, the length of the blueprint should be 24.75 millimeters.