Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many rankings (timeslot) were there for the episode that aired on May 2, 2010?

### Inputs:
table_name: table, columns: ['#', 'Airdate', 'Episode', 'Rating', 'Share', 'Rating/Share (18–49)', 'Viewers (millions)', 'Rank (Timeslot)', 'Rank (Night)']

### Response:
SELECT COUNT Rank (Timeslot) FROM table WHERE Airdate = May 2, 2010