If you're looking to get better, take a freediving class and train under an instructor who can guide you along, help you stretch and prep properly and solve problems with your technique. As Derek says, everyone's capable of 3 minutes or longer; just stay safe and never practise in water alone.
I was a pretty decent freediver and hold an AIDA 3 cert, but I'll spare you my PB as that part of my life is over for now.
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