I'm rather unfit these days - but as a teen I could easily do 3mins at my desk in a class. I can't remember the volume but we did a lung capacity test at school and I had the highest in the class, despite not being sporty or active at all, so I think I have genetics on my side.

I recently tried the 'Wim Hof' method, and was well over 4mins after just a few days practice, and I just went snorkelling and was able to outlast all those I went with. If I was healthier I am sure I could get longer still.