I had my first chemo early June last year and lost my hair two weeks later. My final chemo was in early August and I guess the hair started to grow back pretty soon afterwards but it took quite a while for it to get to a point where I was comfortable to not wear either the wig or a hat. I guess the last time I wore it would have been end of May. So it was around 9 months that I used the wig. But I am used to having a fringe and I did wait until my fringe was a normal length. I probably could have easily got away without wearing it 2-3 months earlier. I've always had longish/shoulder length hair with a fringe so I felt very self-conscious with very short hair. You might be different and find you don't need/want to wear the wig for quite as long as me.