Actress Carrie Fisher (Princess Leia in Star Wars) suffered a heart attack while on a flight, about 15 minutes prior to landing at LAX. After the plane landed, paramedics continued CPR for another 15 minutes before they were able to get a pulse. Her mother, Debbie Reynolds, tweeted this on Christmas day:
Carrie is in stable condition.If there is a change,we will share it. For all her fans & friends. I thank you for your prayers & good wishes. pic.twitter.com/isXJqqFEB6
— Debbie Reynolds (@DebbieReynolds1) December 25, 2016
How long should you continue to do CPR? It definitely depends on the circumstances surrounding the need for CPR, but continuing compressions and rescue breathing until the next level of care is available is definitely advised. According to the study linked, going longer than 30 minutes can make a difference.
Update (December 27, 2016): Carrie Fisher passed away this morning at 8:55 am PST. Rest in peace, Princess Leia. Our thoughts and prayers are with you and your family.