I could see subtle improvement at around the 2 month mark, and I'd used 2% minoxidil for the first month (before I got Lee's). I haven't grown back full temples but a little can do a lot. After maybe 3 months, I no longer felt I had to 'style' me hair to hide the bare right temple. There's enough coverage for me to be comfortable with it. The thickening throughout the front also makes the hairline appear stronger.
I've seen continued thickenin' going on in the last 8 or so months. But for me, the most dramatic diff happened by month 5 or so.
Of course, results vary, but try de stuff, AYE?
Fight On, Hair Warriors!