When I went for first interview in govt ministry few years back, I was too naive to think that the job offer would come within 2 weeks of my interview. End up after 1 month, I still expected a call for 2nd interview, letter or even email if not successful.

Don't keep too much hope, even you just went for an interview yesterday. The greater the hope, the more you will get disappointed if bad outcome. At least you will feel better. Go on applying other jobs that you think suitable or ideal.

Anything is a bonus. If you read earlier posts, there always some saying that they got job offer after 1 or 2 weeks. My advice to you is keep on applying until you are receiving job offer.