CREATE TABLE table_1849243_1 (viewers__in_millions_ VARCHAR2, run_time VARCHAR2)

How many viewers in millions watched the episode 23:55 minutes long?
SELECT viewers__in_millions_ FROM table_1849243_1 WHERE run_time = "23:55"
SELECT "viewers__in_millions_" FROM "table_1849243_1" WHERE "23:55" = "run_time"