I've been using Anki for a several months, and have become accustomed to their "Study Options" pane that greets me when I open the program. I've grown to like how it lets me know when I'm all through reviewing for the day.
My question is this, is there an option like this on Skritter? In other words, how do I know when I've done enough reviewing for the day? Do I just practice as long as I'd like? Or, will it eventually stop me -- and say, "hold on buddy, your brain is full for the day." : )