Those who said zihar has no time limit

Sa'id bin al-Musayyib (may Allah have mercy on him) and al-Hasan (may Allah have mercy on him) said: There is no time limit in zihar, and ila' does not enter into it, however long it may last.

Something similar is reported from Ibrahim (may Allah have mercy on him).

Ibrahim (may Allah have mercy on him) said: If a man makes zihar from his wife and does not fix any term, his wife does not become separated from him, even if he does not have intercourse with her, as long as he is delaying over the expiation.

Ibrahim (may Allah have mercy on him) said: There is no time limit in zihar.

Al-Hasan (may Allah have mercy on him) said: There is no time limit in zihar.

Tawus (may Allah have mercy on him) said: There is no time limit in zihar.

Al-Sha'bi (may Allah have mercy on him) said: If a man says to his wife, "If I come near you for a year, you are to me like my mother's back," then ila' does not enter into zihar.

Al-Hakam (may Allah have mercy on him) and Hammad (may Allah have mercy on him) said: If a man says of his wife that she is to him like his mother's back for four months, and the four months pass, this is ila'. And if he says that she is like his mother's back and then leaves her for a year, this is not ila'.

Sayyiduna Ali (may Allah be pleased with him) said: Ila' does not enter into zihar, nor zihar into ila'.