\textcolor{pink}{\huge \textsf{WELCOME! ^-^}}
@Adub648
Take the time to check out the FAQ and GUIDE if you haven’t already.
There’s also a lot of good stuff on the forum to help you, like:
The Ultimate Additional Japanese Resources List!
The New And Improved List Of API and Third Party Apps
I hope your Japanese learning journey goes well and that you enjoy your time with us on the forums.
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As for your question;
There have actually been several threads about exactly this in the past and the consensus appears to be about two to three hours per day at worst. You’ll obviously require less time to begin with, but as you progress higher through the levels you can expect to have maybe a hundred reviews per day to complete and so your time taken will depend entirely on how long this takes you, how many reviews you get correct, and how long it takes you to do the 10-20 lessons per day you’ll need to do to keep up with those.