11-       Completing an integral while the doubt is still persisting about one's intention during the opening Allahu Akbar (taharrum), or doubting for a long time about this intention. If someone recites the Fatihah while doubting whether or not one intended Dhuhr or ^Asr, one’s prayer is invalid. The prayer is invalid when the time of doubt is long, even if an entire integral did not pass. An example is if one recited the entire Surah of Tabarak while one doubted one’s intention, then one’s prayer is invalid.