CREATE TABLE table_19138 ("EDO Flight" FLOAT, "Shuttle" CLOB, "Mission" CLOB, "Launch Date" CLOB, "Duration" CLOB, "Primary Payload ( s ) " CLOB)

what's the duration with mission being sts-87
SELECT "Duration" FROM table_19138 WHERE "Mission" = 'STS-87'
SELECT "Duration" FROM "table_19138" WHERE "Mission" = 'STS-87'