My horses have hay most of the time, so I don't see it as an issue. However I wait for about an hour after feeding pellets in morning before I ride, and I wait about an hour in eve after I ride before feeding pellets (unless it's a very easy short ride, then I wait for half-hour).
"Life isn't about waiting for the storm to pass: it's about learning to dance in the rain..."
"When we are no longer able to change a situation - we are challenged to change ourselves."
"How people treat you is their karma; how you react is yours."