Because it's a 22 it is most probably in a school.... which means lots of use and abuse. I always taught my students to do a full and proper preflight every time. There are lots of points to mention but your instructor should have pointed these out to you when teaching you the preflight, and should not let you do your own until you are proficient.
As you get to know the machine you'll get more proficient in the preflight and it will go a lot quicker.
Obviously there are the more important ones to check... fuel, blades and everthing connecting to the blades.... which doesn't leave much on a 22...
so do a full one anyway.