CREATE TABLE table_50474 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Event" TEXT, "Round" FLOAT, "Time" TEXT, "Location" TEXT)

What is the total number of Rounds held in Nevada, United States in which the time was 1:55?
SELECT COUNT("Round") FROM table_50474 WHERE "Location" = 'nevada, united states' AND "Time" = '1:55'
SELECT COUNT("Round") FROM "table_50474" WHERE "Location" = 'nevada, united states' AND "Time" = '1:55'