I only wait 20 minutes.. But to be fair, Bella only has a mug and a half of lo-cal. I basically leave it as long as I can, I go move the electric fencing etc so its usually more like 30 minutes but 20 is my minimum
RIP Blossie - 1985 to 8/8/09 - "All horses deserve, at least once in their lives, to be loved by a little girl."
Theoretically you must wait atleast 30 minutes at a minimum no matter what they have eaten. Any more than a standard intake of grass in a set period of time [5-10 minutes] they need time to digest it. Also, if their insulin levels are higher after eating, they need time to lessen before major exercise, as it can make them tire quicker - similar effect if you go swimming after eating. In some sensetive horses, it can cause colic.
I always leave an hour, but the times i used to ride it never got in the way of feeding etc
Just a few more months and we will be fine RIP Rocky x 92 - 27/06/06 x Your hoofbeats have become the very rhythm of my heart