What is intramolecular acid-base catalysis?

How does a carboxylic acid group facilitate intramolecular protonation to form an ester?

What is the mechanism by which a basic group accelerates ester hydrolysis?

If the uncatalyzed hydrolysis of an ester takes 10 hours, and intramolecular catalysis reduces this time by 50%, how long will the catalyzed reaction take?

How can intramolecular catalysis contribute to sustainable chemical manufacturing?