I use it every night. (not advisable to use it in the morning) but you have to wash it off within an half – 1 hour of application. Its not drying for me as i use moisturizer after that and yes it works quite well

Lemon juice contain citric acid and I think it will dry out your skin if not apply moisturiser after that. As you are using lemon juice as toner with a long period can make your skin become sensitive. But as I know lemon juice can make skin fairer, So I suggest that not to use the juice to put on your skin directly. Maybe you can search for products that made by lemon extract.