Definitions:
USC = Universal Shrek Constant (the mean time of all the Shrek movies currently released)
SSC #1 = Single Shrek Constant #1 ; the length of the first Shrek movie
SSC #2 = Single Shrek Constant #2 ; the length of the second Shrek movie
SSC #3 = Single Shrek Constant #3 ; the length of the third Shrek movie
SSC #4= Single Shrek Constant #4 ; the length of the fourth Shrek movie
Shremperial Units:
1 Shrinch = 4.7 inches (the diameter of a Blu-Ray disc of Shrek)
1 Shroot (plural: Shreet) = 12 Shrinches = 56.4 inches
1 Shrile = 5280 Shreet = 63360 Shrinches
Shretric Units:
1 Millishreter = 12 millimeters
1 Centishreter = 10 Millishreters = 12 centimeters (the diameter of a Blu-Ray disc of Shrek)
1 Shreter = 100 Centishreters = 12 meters
1 Kiloshreter = 1000 Shreters = 12 kilometers