The American Red Cross CPR guidelines recommend 100 to 120 chest compressions per minute, 30 at a time.

When providing CPR, 100 to 120 chest compressions per minute at a depth of at least 2 inches, but no greater than 2.4 inches, should be provided. Pauses in compressions should be as short as possible. A goal of a 60% or greater chest compression fraction may be reasonable in persons with an unprotected airway.