He was unable to recall the exact amount of time he had spent on his research, but it was extensive.
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Hiː wəz ʌnˈeɪ.bəl tu ˈriː.kɑːl ðə ɪɡˈzækt əˈmaʊnt əv taɪm hiː hæd spɛnt ɒn ˈhɪz rɪˈsɜːrtʃ bʌt ɪt wəz ɪkˈstɛnsɪv. Hi wez aneibel tu rikal de iɡzekt emaunt ev taim hi hed spent on hiz riserrc bat it wez ikstensiv.
Dia tidak dapat mengingat jumlah waktu yang tepat yang dia habiskan untuk penelitiannya, tetapi itu sangat banyak.
Hiː wəz ʌnˈeɪ.bəl tu ˈriː.kɑːl ðə ɪɡˈzækt əˈmaʊnt əv taɪm hiː hæd spɛnt ɒn ˈhɪz rɪˈsɜːrtʃ bʌt ɪt wəz ɪkˈstɛnsɪv. Hi wez aneibel tu rikal de iɡzekt emaunt ev taim hi hed spent on hiz riserrc bat it wez ikstensiv.