Faculty position decision timeline
It's hard to answer your question without knowing the country and field. I'll answer from my perspective, which probably extends to your situation, but take it with a grain of salt.

Here's a helpful resource describing in detail a typical (successful) job search timeline for computer science tenure-track faculty positions in the US: http://www.pgbovine.net/faculty-job-search-timeline.htm

Most interview invitations are sent out by the end of February. If you haven't heard by mid April (now), then unfortunately I think it's almost certain that you won't be invited. 

Another source of information: Most departments list seminar speakers on their website. When their seminar starts filling up with interviewees, then you know they have been sending out invitations.

Most places never send a formal rejection or, if they do, it comes so late that the outcome was already obvious. So don't expect to hear anything.

Commiserations. The academic job search is tough! I wish you the best of luck in your other endeavours.