It can take a long time. Some employers move very quickly, and others move very slowly. People have been hired three hours or three months (or more) after interviewing. Moreover, hiring nearly always takes longer than employers expect it will; you should generally double or triple whatever timeline they give you.
http://www.askamanager.org/2015/07/how-long-can-it-take-to-hear-back-after-a-job-interview.html
People get busy; hiring decisions can take a lot of time. If you don't continue to let them know your interest, they may think you've lost interest. Keep following up about once a week. If they don't respond at all to a phone call or e-mail, it's okay to keep going for several weeks.
http://workplace.stackexchange.com/questions/23544/how-many-days-to-respond-after-phone-interview
Rehearsing answers to common interview questions can help you prepared so you don't get rattled and ramble too long about irrelevant details. A hiring manager will likely ask open-ended questions that don't have simple yes or no answers, so take time to answer them thoroughly.
http://work.chron.com/long-should-answer-interview-17346.html
Almost two weeks later and three weeks after my interview, I sent the HR manager a quick email to follow up and see if there were any updates, and stressed again my interest in the position. I still have not heard anything back from either email.
http://www.askamanager.org/2015/07/how-long-can-it-take-to-hear-back-after-a-job-interview.html
If you don't feel like you can give a complete interview answer in 60 seconds, shoot for a 90-second answer. Some behavioral questions, such as describing how you might handle a difficult situation with a co-worker or ways you might contribute to a team project require extended details and analyses.
http://work.chron.com/long-should-answer-interview-17346.html
If you get another offer, you can contact this first company and let them know that you have a pending offer but would prefer to work for them and that you have X days before need to get back to the company that made you the offer, and ask if they’re able to give you an expedited decision.
http://www.askamanager.org/2015/07/how-long-can-it-take-to-hear-back-after-a-job-interview.html
1. sometimes you don't hear for up to 2 weeks after an interview. I wouldn't worry about it. That being said, some companies are fast and you will have the offer emailed to you by the time you hang up the phone(happened to me :)).
http://workplace.stackexchange.com/questions/23544/how-many-days-to-respond-after-phone-interview
60-Second Answer. You can usually respond to an interview question in 60 seconds or less. If the interviewer wants you to expound on your answer, he can ask a follow-up question or ask you to proceed with more details. Answers that are 60 seconds or less involve the interviewer because you don't have time to dominate the conversation; he must respond to your comments or ask new questions.
http://work.chron.com/long-should-answer-interview-17346.html
This answer applies to phone interviews, but could just as easily work for face-to-face interviews. First, if you haven't already, send a thank you note. Make sure they know you're interested in the position by telling them explicitly. For other interviews, always send a thank you note right after the interview. In general, you follow-up a week after your last interaction.
http://workplace.stackexchange.com/questions/23544/how-many-days-to-respond-after-phone-interview
About a week later, I received an email from the HR manager following up with how the interview went and to let me know they are still in the process of conducting interviews but that I would be informed when final decisions are made.
http://www.askamanager.org/2015/07/how-long-can-it-take-to-hear-back-after-a-job-interview.html
how long does it take to a job to respond to you after an interview
A job may respond back to you within three hours or three months or more after interviewing. It takes three hours or three months to a job to respond to you after an interview.