2x a day, morning and evening. The issue is going to be that its not like other fish where you drop the food in and leave. Seahorses are a little more time consuming with thawing and enriching food, and then the actually feeding. Usually you need to turn down the flow or turn it off while they are eating, and then turn it back on when they are done. With my new horses, it can take them a half hour or more to pick at the food until its gone because they are still hunting my live rock. So, she'd need to thaw, enrich, feed and turn off flow first thing in the morning, and then turn the flow back on before she leaves for work. Its do-able.