There is sperm in her hands, then about 10-15 minutes, she pees and rinses the vagina with water without soap, is there any chance of getting pregnant? is the room with ac the sperm dries up within 15 minutes?

She will not get pregnant from "the sperms in her hands" nor from her washing her vagina with water without soap". The possibility of such a pregnancy is so remote as to be reportable and published. If neither her nor you want an unplanned pregnancy, why not seek effective contraceptives like an intrauterine device ( IUD) or a subdermal implant...plus male condoms.