At level 2 I’d say go slow for now, and ramp up later once you are settled in. As I had to learn the somewhat hard way it takes a while for the lessons you do now to kick you in the butt (cough first wave of burn reviews cough).
Don’t make the mistake I made and just stack 50 lessons a day because it’s a weekend and you are bored. They will eventually come back and hit you like a truck at the most inconvenient time.
Best thing I think is to find a fixed number of daily lessons and stick with that. Only adjust it up or down a little depending on your projected daily reviews and number of apprentice items. Rule of thumb seems to be that you want half as many apprentice items as you are willing to do reviews every day - take that with a grain of salt, though.
You could do just five lessons each day, or maybe thirty, or somewhere inbetween. Around 20-25ish with a good retention rate seems to be fine if you want to finish in about the shortest time the crabigator will allow per level, but for me, that’s already too much.