They cover between  per night; however, some studies have shown that they may traverse as far as  in a night.
ðeɪ kˈʌvɚ bᵻtwˌiːn pɜː nˈaɪt; haʊˈɛvɚ, sˌʌm stˈʌdiz hæv ʃˈoʊn ðæt ðeɪ mˈeɪ tɹɐvˈɜːs æz fˈɑːɹ æz ɪn ɐ nˈaɪt.