How many objections is a lawyer permitted to make throughout the entirety of a court session?

It is permissible to object as often as an attorney wants. However, even if the objection is technically correct, it may not be the correct thing to do. Almost everytime a witness opens his mouth, an evidence rule is technically broken. It REALLY makes You look bad if YOU object to every single one of those! Part of being an effective attorney is knowing when to let the small things slide.