Postponing Algorithm

No, there isn’t. But there also wasn’t under the SM-2 algorithm. The logic is the same – your brain doesn’t take weekends and holidays off. As long as your memory keeps decaying (an unhaltable process), your cards will keep needing to be reviewed.

True, there are add-ons that will offer to push your whole collection by X days – but I would say they harm more than they help. While longer-interval cards might be fine showing up delayed by a few days, even just a day or 2 or 3 can make a big difference for a shorter-interval card. And if that results in more lapses, that actually increases your workload, instead of just shifting it.

I think the FSRS Helper add-on is the only one that takes an intelligent approach: cards are only moved if it can be done with minimal damage. It uses that logic for easy days, but it also uses it for load-balancing and advance/postpone – which you might want to take a look at, because it seems like they would help you plan ahead for taking a day or 2 off when you need to. Advance some cards before, postpone some cards after, use load-balancing to smooth things out.

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