Actually when I started I had no idea about how the SRS system worked. I would do reviews when I wanted to and liked to do lessons more than reviews. When I read about how it works (SRS system) the time I spent on a level decreased. First it was 1 month and some 30 days 
, then it reduced to 20 days after I started doing my reviews when they were available, then 12 days when I actually implemented what @jprspereira had said here.
Oh no, I didn’t mean it like that. I just felt like saying it. I am sorry if I sounded rude. 