How many hours once diaper to be changed if it's not soiled for 4 months baby

Hi, If the baby is sleeping and the diaper is not soiled say for 6 hours, let it be. You can by touching the diaper figure out whether the moisture has build up it being against the body and there is need to change it or not. You can slip a finger and can know there is need for change or not. Else, if the diaper remains dry during the hours when the baby is awake you can change it after say 4 hours.