Tampon time?

Christy • Diagnosed with PCOS 8/4/2016
So recently I changed over from pads to tampons. I know this sounds ridiculous that I've never worn one until now at the age of 23 but I just had some questions about how many times I should change them. Normally I change them every 2-5 hours depending on the heaviness of my flow but I've heard of girls leaving them in all day and even sleeping in them. 

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