Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Dr. Gregory House:  You Jewish ?
Dr. Petra Gilmar: Yes .
Dr. Gregory House: Is it true what they say about Jewish foreplay ?
Dr. James Wilson: Uh ... uh ...
Dr. Petra Gilmar: Two hours of begging ?
Dr. Gregory House: I heard _ four _ .
Dr. Petra Gilmar: Well , actually ... I 'm only half Jewish .

hours