I don't know exactly how many weeks but I can tell you when it was;
The first morning commute after the time change back in November. A car passed really close while laying on the horn. The only two on the road for "miles" were that vehicle and me. They could've easily pulled over and passed, unimpeded in the adjacent lane.

fwiw, I've noticed a trend. I get the hostile pass/driver at the major time changing landmarks in the calendar; When school starts, lets out, at the beginning or end of daylight savings time etc.
I believe this to be a result of people adjusting their schedules - so I'm encountering a new group of drivers. After a couple weeks they get accustomed to seeing me there and the hostilities subside - until the next time altering event.