CREATE TABLE table_203_778 (id DECIMAL, "representative" TEXT, "title" TEXT, "presentation\ of credentials" TEXT, "termination\ of mission" TEXT, "appointed by" TEXT)

which ambassador to honduras served the longest term ?
SELECT "representative" FROM table_203_778 ORDER BY "termination\nof mission" - "presentation\nof credentials" DESC LIMIT 1
SELECT "representative" FROM "table_203_778" ORDER BY "termination\nof mission" - "presentation\nof credentials" DESC NULLS LAST LIMIT 1