There is no specified number of times

According to Article 18 of the "Law of the People's Republic of China on the Protection of the Rights and Interests of the Elderly", family members should care about the spiritual needs of the elderly and must not ignore them. , neglecting the elderly. Family members who live separately from the elderly should visit or greet the elderly frequently. The employer shall protect the dependents' rights to visit relatives and take leave in accordance with relevant national regulations.

Regardless of whether the law stipulates it or not, everyone will get old one day, so you must treat the elderly well! What's more, they are still your parents, so you must treat them with care!