How many weeks in the top 10 was spent by a song performed by Peter Kay?
CREATE TABLE "2009_peaks" (
  "entry_date_a" text,
  "single" text,
  "artist" text,
  "peak" real,
  "peak_reached_a" text,
  "weeks_in_top_10" real
);
SELECT MAX("weeks_in_top_10") FROM "2009_peaks" WHERE "artist"='Peter Kay';