Al-Kulayni narrated in his famous book “al-Kafi” 2/19/#6 such words of imam:
وَ كَانَتِ الشِّيعَةُ قَبْلَ أَنْ يَكُونَ أَبُو جَعْفَرٍ وَ هُمْ لَا يَعْرِفُونَ مَنَاسِكَ حَجِّهِمْ وَ حَلَالَهُمْ وَ حَرَامَهُمْ حَتَّى كَانَ أَبُو جَعْفَرٍ فَفَتَحَ لَهُمْ وَ بَيَّنَ لَهُمْ مَنَاسِكَ حَجِّهِمْ وَ حَلَالَهُمْ وَ حَرَامَهُمْ
In short he said: Shias before came imam al-Baqir didn’t know rituals of hajj, and didn’t know what is lawful and what is unlawful, and then Abu Jafar came and teach them rituals of haj, and what is lawful and what is unlawful.
Majlisi in his “Miratul uqul” said this hadith has a sahih chain.
Prophet S.A.W. (pbuh) died in 11-th year of hijra.
Imam Abu Jafar al-Baqir was born in 56 year of hijra. Let us imagine that he started teaching shias when he was 5 years old. 56 plus 5 minus 11=50years. So in accordance to this hadith, 50 years shias spend in ignorance, without knowledge of hajj rituals and without any idea about halal or haram.