Last year, 94 life-threatening emergency calls saw ambulances arrive more than four hours later.
The longest waiting time in the country was recorded in Waterford, where an emergency call saw an ambulance reach the distress call seven hours and 10 minutes later.
According to Freedom of Information figures, released to Newstalk, waiting times for 21 calls nationwide were over five hours.
The HSE aims to respond to life-threatening heart and respiratory calls within 18 minutes and 59 seconds in 80% of cases.
Other life-threatening emergencies should be responded to within the same timeframe in 50% of cases.
On almost 6,200 occasions last year, it took over an hour for an ambulance to respond to either of these types of calls.
After Waterford, other lengthy waiting times were noted in Cork and Westmeath, where it took more than six hours for an ambulance to arrive.
A total of 233 response times were over three hours.
Locally, efforts have intensified in recent years to increase the number of trained Community First Responders to attend the scene while the ambulance is en-route.
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