I think the other thing to note is that this is fine, in the grand scheme of things. The review intervals start at 4 and 8 hours, so the “ideal” (especially if you’re trying to go fast) is a schedule that says “do lessons in the morning, then review 1 4 hours after that, then review 2 8 hours after that” (there is discussion in the “ultimate guide” post about that). But somebody did some modelling of different numbers of reviews a day, and if you can do WK at least twice a day that isn’t that much slower overall than the theoretical optimum. And the in practice limit on speed for almost everyone is “how many reviews do you really want to do a day?”.