CREATE TABLE table_203_759 (id DECIMAL, "year" DECIMAL, "company" TEXT, "number of members affected" DECIMAL, "duration of strike" TEXT, "notes" TEXT)

how many total days was at & t on strike ?
SELECT SUM("duration of strike") FROM table_203_759 WHERE "company" = 'at&t'
SELECT SUM("duration of strike") FROM "table_203_759" WHERE "company" = 'at&t'