How long do you pump?

New to pumping - how long do you pump for all the lactation consultants ive talked to say only 10-15 min per session but i feel like i barely get anything out i tried 30 min just to see and i got way more and i felt like i could keep pumping and but google says pumping more than 30 min can cause damage but ive seen tiktokers say they pump for an hour even

Im confused