For reference, the National Institute for Occupational Safety and Health (NIOSH) recommends that workers not be exposed to sound levels higher than 85 decibels for more than 8 hours per day. At 115 decibels, the amount of time before hearing damage can occur is reduced to just 15 minutes.
Therefore, it is important to take precautions to protect your hearing if you are planning to attend an Avenged Sevenfold concert. This includes wearing earplugs or earmuffs, and taking breaks from the loudest areas of the venue.