Sensitive Altimeter. This Android application measures air pressure using internal barometric sensor in the portable device and displays it on a three-pointer altitude indicator similar to the altimeter gauge in aircraft. Digital indication is also available.
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.
Actually, there is no one-size-fits-all answer to the question of how long after the interview should you hear back. To answer this question, you should yourself decide as to the timeframe depending on the position that you have applied for and the company profile in the job market.