According to The Hollywood Reporter, pre-production started in April 1993, and filming in June the same year.
ɐkˈoːɹdɪŋ tə ðə hˈɑːliwˌʊd ɹᵻpˈoːɹɾɚ, pɹˈiːpɹədˈʌkʃən stˈɑːɹɾᵻd ɪn ˈeɪpɹəl nˈaɪntiːnhˈʌndɹɪd nˈaɪnti θɹˈiː, ænd fˈɪlmɪŋ ɪn dʒˈuːn ðə sˈeɪm jˈɪɹ.