Thanks for the advice!
I did many cards per day in the N5 and N4 area as I know many of them through immersion and early textbooks attempts.
If you exclude grammar, my knowledge in Japanese is somewhere around N2 level. I’ve read nearly 1000 news and a few books in Japanese. So I know a lot of stuff through immersion already.
I now just reached a point where immersion just doesn’t really work anymore and therefore I want to fix my weakness with grammar. Textbooks don’t work for me, therefore Bunpro, that works. The N3 level stuff is by far harder for me than N4 and N5 and I already saw that five per day (my typical ratio for N4/N5) is tiring.
But the main problem are the short intervals. The amount would be totally manageable for me with 24 hours as minimum. But if you have to break up your reviews into multiple sessions per day because it piled up so much and then you get the wrong cards again and again and again on a single day, the review pile up in a crazy way.
E.g. I had around 220 due cards on one day but had to do 390 reviews to get to zero. That’s completely insane! And it takes hours to complete.
My main problem was also that I couldn’t do all reviews for a few days because I just didn’t have enough sparetime. And then I ended up in a SRS review hell that I never experienced in that way in Anki. The main problem are the short intervals because they turn everything into a Sisyphus like work, where you see no end. You do a lot of reviews, a new hour begins and the counter goes up again and it seems like you achieved nothing. That’s extremely demotivating and frustrating.
As this seems not to be fixable by myself (i.e. editing the intervals), I’ll have to turn down reviews like you suggested. The reviews for today are already down to 150 (240 yesterday), so I seem to get out of this nightmare after having invested countless hours this week.