Thirty minutes is indeed a short polygraph examination, and would probably be considered unacceptably short by most polygraph associations. They have a derogatory term for a polygraph operator who give such hurried polygraph examinations: chart roller.

The absence of any post-test accusation of deception is generally a good indication that one has passed. But since this polygrapher doesn't seem to follow standard polygraph practice, it's hard to tell.

I recently took a polygraph test. All i had in my test was a pre test interview, no "stim test" and 2 sets of questions all relevants and irrelevants. My whole test lasted 30 minutes. At the end of my test the examiner asked me "What is in my mind when I'm asked about drugs", I replied "nothing at all". I told him in the pre-test that I never used any drugs. Then he asked me "if I ever had any family member or friend that used drugs that made me uncomfortable". I replied "I had a childhood friend that he got into drug addiction and he died because of an overdose". He never accused me about anything. The examiner told me that he was going to send my results to my recruiter and if there is something wrong he would contact me. Also he told me to make sure that I go to my psychological evaluation that was already scheduled before taking the polygraph test. 
Any opinion or reflexion??? Did I passed or failed???