Having a graph for *queue size* would help in the optimization of break length and workload allocation.

Currently I am doing it manually.

You mean by items for review?
You can see the graphs of upcoming reviews by clicking on the "click here to calculate" mark on the study page...

First it gives you a 5-day overview, but if you click on those graphs, it can give you an 8-week overview.

Thanks， I am referring to the ex post queue length, not the ex ante queue length.

So, graph of number of reviews? Because ex-post isn't really a queue, no?

Ex post queue length in the sense that the queue length is measured at any point of time and then looked at in retrospect. This would give the possibility to see how queue length has been reduced over time.

I agree with Foo Choo Choon. I was on vacation (touring China) for a few weeks after I had added a lot of words. I then spent almost a month trying to work through all of my reviews and learn all of those words I had mostly forgotten. During that time there wasn't much to see in my progress page. It would have been a cool graph that showed when I came home I had 2500 reviews and a week later I was down to 2000, then 1400, and so on. Would have felt more like progress when the rest of the progress page was showing negative. The obvious time to measure would be at the start of each day (4am).

I also understand that there's a ton of data Skritter already shows us and this is a 'less' important graph.

markschow, yes, that's precisely what I mean.

Many SRS beginners, e.g. users of Anki or Skritter, discontinue once confronted with a long queue.

Idea: "Post-holiday mode": When you have >500 reviews due, the main graph automatically switches to queue length.

It's been mentioned before (by me if no one else!) that SRS systems concentrate on what you don't know rather than what you do. I think this is related?

This might be interesting to make, but we don't have time to build it any time soon. However, this would be something pretty easy to do with the Skritter API, which is in beta. Does anyone want to take a crack at it?