I think I haven’t seen 0 lessons from level 8 or even longer, and I don’t have any problems because of that. But everyday I do all reviews, so I see “0 reviews” at least once in a day.
I have to say, that constant movement with stable everyday speed (for instance 10 new lessons per day) gives you very predictable workload with reviews, very solid progress, there will be no tsunamies. You can easily get used to it and find time in your daily schedule. If you find that there are more reviews than you can manage everyday, than just slow down your amount of new lessons, and after several days, your review workload will go down too.
Trying to learn all 100 lessons as fast as possible (worst - in one day) will cause waves in your schedule. One day you will have 50 review, on next day - 150, then 50 again, and then wooops, several waves sum together, and you have 500 reviews. Here it is - small tsunami, that could break you habbit, you skip reviews for 2-3 days and you will get big tsunami in 1000 reviews. Then reset few levels because this can’t be handled. Wasted time.