Just as the title says.
I think the time until the next review should not be shown by default. In my opinion, and from what I have seen with my students who use Anki, they tend to use the time as a way to calibrate which button to press, but I think they often misjudge their own ability. So they see a word they know but they see the “Good” time shows, say, 7 days, and the “Easy” shows 1 month, so they press “Easy” but only because they think they will still remember the word in 7 days, but they don’t. This behavior won’t be very stable either, and they will assess another word differently for a number of reasons, even if the recollection effort was basically the same.
In general, I think this adds to the processing load when assessing answers for a card (you have to decide whether you remembered it correctly, whether your recollection was Hard, Good or Easy, and then triangulate that with the time until next review).
I personally have the time hidden, so it doesn’t bother me directly, but most people won’t go into the settings to find this option, or they might even think it’s better having the time shown just because it’s on by default.
So my suggestion is to turn this off by default, lowering the cognitive load and making the interface lighter, and then let the (power) user decide if they want to show that extra information.
This will be even clearer if Pass/Fail Grading as Default is implemented, since there would be no reason to show the times, I guess. And in any case, I believe for most users the best way to go is to simplify things, not think too much about the self-assessment and trust the algorithm.