How long can we be out of the country?

My husband has a carte de sejour pluriannuelle (2yrs long stay visa), we wanna go holiday this year out of Europe to visit my in laws but we're wondering if the visa will be cancelled and if it will impact his resident card application if we are out of the country for a while, we planning to go for 3wks maybe a whole month :/

Can't find the regulation

Thanks 😊

@Clemntine I don't think it will affect on your husband residency.If he has 2 years schengen visa, he will be okay to be in and out of EU on that period. But, if you are in doubts, better ask the sous préfecture or prefecture in your area.