How Long To Change Tampon. If you try to change your tampon and it still has a lot of absorbency or only has a little blood on it, try switching to. For a heavy flow, the tampon may need to be changed every few hours.
For a heavy flow, the tampon may need to be changed every few hours. Try to choose an absorbency level that’s comfortable and does the job for at least. If you are prone to a heavy flow, it’s best to change your tampons around every two to six hours.