how long has it been on
how long have it be on
pro:int adj aux pro:per cop prep
how long has it been on ?
h aʊ WORD_BOUNDARY l ɔ ŋ WORD_BOUNDARY h ɐ z WORD_BOUNDARY ɪ t WORD_BOUNDARY b ɪ n WORD_BOUNDARY ɔ n WORD_BOUNDARY
h o w WORD_BOUNDARY l o n g WORD_BOUNDARY h a s WORD_BOUNDARY i t WORD_BOUNDARY b e e n WORD_BOUNDARY o n WORD_BOUNDARY