I had over 1,000 reviews in a my backlog 
Fell off the wagon a couple months ago when I went on vacation. Ended up falling into the trap of “I’ll deal with them at the weekend” (and never doing so) for many weeks.
I’m glad to see I trudged through the entire backlog this last week 
. I’ve got my reviews back down to a manageable daily level and should start doing lessons again in the new year.
The lesson I’ve learned? Use vacation mode. It’s there for a reason. I would have had lower success rates with my apprentice level cards when I came back, but it would have been infinitely better than a horrendously demotivating mountain of reviews.
Praise the crabbigator 