Forum:Breath Timer

So I'm making a Lizardfolk for a Dnd campaign, and it's constitution stat is 22. Acording to this Reddit post, a greater Constitution, means you can hold your breath for longer. I estimate it's about 380 seconds my character can hold his breath, is this true? https://www.reddit.com/r/DnD/comments/cn60wc/holding_your_breath_swimming_in_5e/