I have applied in just about every window for the last 5 years. I have taken the test many times. I have learned that the test is good for 12 months, even though you take it again after every app update it will not change your score until you pass the 12 month mark and take it again. Once you passed the test it can take anywhere from a few days to a few months to hear back. You will not receive any indication if you passed the test or not. If you receive an email from an actual HR person with a Pilot questionnaire then you have been selected for an interview and as long as you answer the questions well you will receive and email with interview dates. After the interview you go home and wait. Your next communication is a 'thanks but no thanks' email or an email to take a drug test. If you get the drug test email then the job is yours. This email can take soon time as VX is doing your background check.
I do not work for VX and I have gotten all this information from the message boards and through taking with people who work there.
I hope this help those who are interested and good luck.