I do it almost daily from 20-60 minutes.
Now, since today morning I am having a mild headache(forehead).
Headaches are not common for me, so, I googled it and found this on a website
After meditating daily for almost a month, I began to get odd pressures in my forehead. It felt as if someone was putting their hands on the sides of my head and pressing slightly or giving a massage. I didn't know what it was, but something told me this was a good thing and it felt good. Later, I found out that this is what it feels like when you open your crown chakra and third eye chakra. If you feel sensations or pressures in the upper part of your head or the middle of your forehead, that is what's happening.
So, I just wanted to know your opinions.