There are multiple definitions - click on the translation that matches your context.

reasonable diligence means:

• diligencia de un buen padre de familia
• diligencia de un ordenado comerciante
• diligencia de un ordenado empresario
• diligencia media

diligencia de un ordenado comerciante means:

• reasonable diligence
• reasonable care
• care of a reasonable businessperson
• diligence of a reasonable businessperson