PLEASE NOTE THAT PRICES MAY VARY FROM STORE TO STORE Introduce Capstone Prolong Time to your horse's diet gradually over a period of 4 to 7 days. Capstone Prolong Time should be fed in conjunction with a minimum of 1% bodyweight (5kg for a 500kg horse) of quality roughage such as chaff or hay as a fibre source for optimum hindgut digestion.