Logging in and out usually works for this.
The amount of lessons someone should do in one go differs from person to person.
I have always done everything at once, and in retrospect that was a bad decision. Memorizing 82 lessons at once will guarantee that you forget at least a few of them.
What I usually see is that people do about 10-20 lessons per day/per session, in that way, the learning is more spread over time, and you won’t receive an 82 item review stack next time.
For maximum speed, I also see a lot of people using the reorder script, which allows you to enforce a certain order in your lessons and reviews, based on level or item type. I have linked that script below.
Be careful with this script! It is tempting to ignore all the previous level’s vocab in exchange for doing all radicals and kanji of the next level first, but in the long run that will really clog up your lessons, and most importantly, the vocab functions as kanji reinforcement, which is quite important for longer term remembrance of the kanji. I’d recommend always doing your vocab first in your lessons.
Have a look, but be cautioned!