CREATE TABLE table_49144 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Event" TEXT, "Round" FLOAT, "Time" TEXT, "Location" TEXT)

How many total rounds used the submission (choke) method?
SELECT SUM("Round") FROM table_49144 WHERE "Method" = 'submission (choke)'
SELECT SUM("Round") FROM "table_49144" WHERE "Method" = 'submission (choke)'