[seems an hour or 2 would be plenty.]
You probably are right,if you already have experience at setting cable restraints.I have taken it and enjoyed those four hours,i spent there...Part of it will be outside,showing how to make sets and going over what you can and cannot do.The most will be inside.Reading,test,questions asked,and general talking...Nothing to it!...I wish i knowed why they asked me all the questions tho?