Incidentally, on windy days when the ball is difficult to catch or at twilight when baseballs are hard to see, it's a good idea to deviate from your regular infield practice and hit some infield pop-ups to all areas.
you may have time only for infield - letting another coach hit the outfield elsewhere.
Our rule is that the call must be made when the thrown ball from the outfield leaves the green grass line and crosses over the dark infield dirt line - or what we call "green to brown.
Sparky Anderson had a similar rule, directing outfielders with average arms to always throw to the infield on fly balls with a runner tagging at third or on singles with a runner coming home from second - unless it was in the last three innings with the game on the line.
But DON'T let them wander far out into the infield just to make you look good.