CREATE TABLE table_204_812 (id DECIMAL, "#" DECIMAL, "prime minister" TEXT, "date of birth" TEXT, "start date\ of  ( first )  term" TEXT, "age at beginning\ of  ( first )  term" TEXT, "end date\ of  ( final )  term" TEXT, "total time in\ office" TEXT, "date of death" TEXT, "lifespan" TEXT)

the most number of days an australian prime minister was in office was how many days ?
SELECT "total time in\noffice" FROM table_204_812 ORDER BY "total time in\noffice" DESC LIMIT 1
SELECT "total time in\noffice" FROM "table_204_812" ORDER BY "total time in\noffice" DESC NULLS LAST LIMIT 1