question: When did Russell visit each of the congregations to provide the format he recommended to conduct their meetings ?
answer: during 1879 and 1880
turker_answer: Russell visited each of the congregations to provide the format he recommended to conduct their meetings during 1879 and 1880 .
rule-based: Russell visited each of the congregations to provide the format he recommended to conduct their meetings during 1879 and 1880 .