Right so this is exactly why I stick to main roads after dark now. I had something almost identical happen on the B3306 out near St Just about two years ago. Left a friends house at half ten, checked the time, next thing I know its half midnight and I'm parked up in a layby with no memory of getting there. The weird part was the engine was off and cold, like it had been sitting a while.
The missing time thing is one of the most consistent details across abduction accounts and it honestly doesn't get talked about enough. Witnesses almost always describe that same moment of snapping back to awareness with no transition, no drowsiness, just suddenly THERE again.
What road were you on? Any physical symptoms after - headache, nosebleed, unusual thirst? Those are the details that really help piece together what might have happened. Would love to hear the full account if you're comfortable sharing it.