No, you won't become physically addicted after 2 days of consecutive use (what you're proposing). Most people can become physically addicted after two weeks of consecutive use, but everyone's different. There's also rebound anxiety that will occur, but that's after a maybe 2-7 day binge. After that you may become a little physically dependent. Benzo's are NOT to fuck with. The withdrawal is worse than heroin in most people's opinions, and it can last a long, long time. That xanax you had 11 days ago? Don't worry about it, it's already removed from your system, and your tolerance is most likely reset (for benzos/xanax).
Anyways, the only fear you should have about addiction, is your psychological one. You said you have a job interview tomorrow and "need" to take another 1.5. This is telling me you're using an excuse for your drug-use. "Oh, I have a interview tomorrow, I don't want to stress out and blow it". Well, this excuse will manifest into more excuses, for using the same type of drug (benzos). Next, it'll be "Damn, I gotta talk to my boss today about promotions, I know it'll be super-stressful, so I need a xanax". Or, "I've had one stressful day, I deserve a xanax".
With benzos, don't play around. Use the xanax, max, one time every week if you don't want to become physically-dependent, but you could become more and more psychologically-dependent after more use and uses of it as a quick fix for stressful situations.