How many rankings timeslot one () have been there episode that had aired May 2, 2010?
# Airdate Episode Rating Share Rating/Share (18–49) Viewers (millions) Rank (Timeslot) Rank (Night)
The Amazing Race 16
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1-23397386-2
US ratings
US ratings
1 February 14, 2010 "Nanna Is Kickin' Your Butt" 5.1 8 2.8/7 9.07 1 1
2 February 21, 2010 "When the Cow Kicked Me in the Head" 5.2 8 2.9/7 9.11 1 1
3 February 28, 2010 "Run Like Scalded Dogs!" 5.8 9 3.2/8 10.24 2 4
4 March 7, 2010 "We Are No Longer in the Bible Belt" 4.5 7 2.6/7 8.05 2 4
5 March 14, 2010 "I Think We're Fighting the Germans, Right?" 5.8 10 3.0/9 10.10 1 3
6 March 21, 2010 "Cathy Drone?" 6.9 11 3.8/9 11.99 1 4
7 March 28, 2010 "Anonymous?" 7.2 11 3.9/10 12.73 1 3
8 April 4, 2010 "You're Like Jason Bourne, Right?" 5.2 9 2.7/8 9.14 1 3
9 April 11, 2010 "Dumb Did Us In" 6.9 11 3.4/10 11.88 1 3
10 April 25, 2010 "I Feel Like I'm in, Like, Sicily" 6.3 10 3.2/9 10.69 1 3
11 May 2, 2010 "They Don't Even Understand Their Own Language" 6.0 10 3.0/9 10.29 1 3
table_23397386_2
SELECT COUNT Rank (Timeslot) FROM table WHERE Airdate = May 2, 2010
May 2, 2010