How long till my MMR get's back to normal?

I had a loosing streak a while ago but have been winning and loosing normally lately. I'm aware that my MMR is reflected by my winns and losses and that no one truly knows what and how the MMR algorithm works. I'm currently gaining 17 lp from wins and loosing 20 however it has been a while and my lp gains and losses haven't gone back to normal (used to get 22 lp from wins and loose 18). Just wondering if anyone knows the approximate time till it returns back to normal.
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