At max speed, it’s possible to level up in about 7 days. If you do go at that pace, you’ll have a lot of items going into Apprentice, so you’ll have more reviews in a shorter time. If you’re comfortable going at that pace, then by all means do it, but it’s perfectly fine to take longer. If you space out your lessons (I try to do 20 a day) you can still level up fairly quickly. And keep in mind that there’s no specific method that works for everyone. 
(I really like the Expected Daily Reviews script. It shows how many reviews you can expect per day, so if it’s more than you’re comfortable with, you should wait to do more lessons. [Userscript] Expected Daily Reviews)
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