What is the highest number of laps with a time of +6.643 and grid less than 2?
CREATE TABLE "125cc_classification" (
  "rider" text,
  "manufacturer" text,
  "laps" real,
  "time_retired" text,
  "grid" real
);
SELECT MAX("laps") FROM "125cc_classification" WHERE "time_retired"='+6.643' AND "grid"<2;