What is the highest lane for heat 6 with a time of dns?
CREATE TABLE table_70812 (
    "Heat" real,
    "Lane" real,
    "Name" text,
    "Nationality" text,
    "Time" text
)
SELECT MAX("Lane") FROM table_70812 WHERE "Heat" = '6' AND "Time" = 'dns'
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: What is the highest lane for heat 6 with a time of dns? ### Input: CREATE TABLE table_70812 (
    "Heat" real,
    "Lane" real,
    "Name" text,
    "Nationality" text,
    "Time" text
) ### Response: SELECT MAX("Lane") FROM table_70812 WHERE "Heat" = '6' AND "Time" = 'dns'