mˈeɪntənənsfɹˈiː ˈɑːpɚɹˌeɪɾɪŋ pˈiəɹɪəd ˈɛmfˈɑːp ɪz ɐn ɔːltˈɜːnətˌɪv mˈɛʒɚɹ ʌv pɚfˈoːɹməns tə ðə mˈiːn tˈaɪm bᵻtwˌiːn fˈeɪlɪɹz ˌɛmtˌiːbˌiːˈɛf, dᵻfˈaɪnd æz ðə tˈaɪm pˈiəɹɪəd dˈʊɹɹɪŋ wˌɪtʃ ɐ dɪvˈaɪs wɪl biː ˈeɪbəl tə pɚfˈɔːɹm ˈiːtʃ əv ɪts ɪntˈɛndᵻd fˈʌŋkʃənz, ɹᵻkwˈaɪɚɹɪŋ ˈoʊnli ɐ mˈɪnɪməl dᵻɡɹˈiː ʌv mˈeɪntənəns.
Maintenance-free operating period (MFOP) is an alternative measure of performance to the mean time between failures (MTBF), defined as the time period during which a device will be able to perform each of its intended functions, requiring only a minimal degree of maintenance.