Yup. My experience is here:
Basically, I got so overwhelmed that I just stopped WK completely for a couple of months. I managed to claw my way back but it was much harder.
This is what I’ve ended up doing. My actual level up is probably close to 7 days, but my average is 11 because those first 3 or 4 days are just clearing out vocab. Also, every five levels I’ll take some extra days to catch up and bring my apprentice count down.
This has been especially important since hitting the fast levels. Those can be brutal if you stick to the same pace.