How many feedings per bale of hay?

Please be more specific. What do you mean by this question, are you referring to how long a bale of hay will last when fed to livestock? How many livestock are you asking about? What type or class? What size is the bale, what type, what weight? What does it comprise of (i.e., grass only, legume only, or legume-grass)? All of these questions need to be answered before this question can actually be answered.