SCHEMA:
CREATE TABLE table_name_70 (grid INTEGER, laps VARCHAR, bike VARCHAR, time VARCHAR)
USER:
What is the largest Grid that has a Bike of honda cbr1000rr, and a Time of +20.848, and a Lap greater than 24?

QUERY:
SELECT MAX(grid) FROM table_name_70 WHERE bike = "honda cbr1000rr" AND time = "+20.848" AND laps > 24