Feeding Snails Veggies

[Gazoo]

I have a Ramshorn that I believe gets very little food since when I feed the tank it looks like very little misses my fishes mouths. I have been supplementing its diet with zucchini, cucumber, lettuce and lima beans. My snail will stay glued to the veggie until its gone. Would you take it out after X amount hours or do you not worry about it and keep it in until it's gone?

 

[three-fingers]

I've always been told to keep in in for 24 hours, and thats what my all my lfs do