How many dates were recorder administered when poll were sourced from Strategic Vision and the Republican Jack Hoogendyk had 29%?
CREATE TABLE table_21057 (
    "Poll Source" text,
    "Dates administered" text,
    "Democrat: Carl Levin" text,
    "Republican: Jack Hoogendyk" text,
    "Lead Margin" real
)
SELECT COUNT("Dates administered") FROM table_21057 WHERE "Poll Source" = 'Strategic Vision' AND "Republican: Jack Hoogendyk" = '29%'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many dates were recorder administered when poll were sourced from Strategic Vision and the Republican Jack Hoogendyk had 29%? ### Input: CREATE TABLE table_21057 (
    "Poll Source" text,
    "Dates administered" text,
    "Democrat: Carl Levin" text,
    "Republican: Jack Hoogendyk" text,
    "Lead Margin" real
) ### Response: SELECT COUNT("Dates administered") FROM table_21057 WHERE "Poll Source" = 'Strategic Vision' AND "Republican: Jack Hoogendyk" = '29%'