If masturbation is repeated a few times in Ramadan, does it require kaffarah?

Masturbating once while fasting in Ramadan is to make up the broken day, so what is the expiation for performing it for 4 or 5 days in one Ramadan? Does it require making up the broken days or kaffarah of 61 days?

If a fasting person masturbates resulting in ejaculation, his fast is invalidated and requires to be made up. If it is repeated for a few days in Ramadan, broken days are made up in the number of invalidated fasts. It does not require kaffarah.