Reference: Fataawa Mu'aasirah p85
Question: Is premature ejaculation a permissible reason for the wife to ask for divorce?
I know that sexual impotence is a [legally acceptable] reason [for requesting a divorce], however, if the husband ejaculates after [only] ten or twenty seconds, then how is he to be considered in this situation?
Response: If she is affected by that and [as a result] she misses out on her share of [sexual] pleasure, then there is no harm in her asking for a divorce, and if she has children, then she should not be hasty [in seeking a divorce]. And Allaah [alone] has the Complete knowledge [of all affairs].
