[Frosty Crunch]

What does the Fixed/Unfixed setting in the Preferenced for Default Review Time do? I've done a little TIAS ("try it and see" in IRC lingo), but I can't figure it out.

At first I thought it would force all reviews to a single day, but this doesn't seem to be the case, at least retroactively.

Also, what are the Calendar Start Day, Work Day Hours, and Work Week Days for?