try it and see. You will get all sorts of answers to that question. I wouldn't. 4x's/week is my sweet spot.
I don't mean just weightlifting. I also mean cardio and HIIT.
Slowly increase intensity and you can train everyday, but you will find a point where your body can take only so much. You will either have to reduce intensity or take rest days.
How do I reduce intensity?
I should still be active on rest days, right?
You need total bed rest, everyone knows this...