how long has this been on
how long have this be on
pro:int adj aux det:dem cop prep
how long has this been on ?
h aʊ WORD_BOUNDARY l ɔ ŋ WORD_BOUNDARY h ɐ z WORD_BOUNDARY ð ɪ s 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 t h i s WORD_BOUNDARY b e e n WORD_BOUNDARY o n WORD_BOUNDARY