Name the most losses for leslie mann
CREATE TABLE "table1_16512618_1" (
  "year_affiliation" text,
  "wins" real,
  "losses" real,
  "winning_pct" text,
  "gb_division_standing" text,
  "manager" text
);
SELECT MAX("losses") FROM "table1_16512618_1" WHERE "manager"='Leslie Mann';