The God of small things

Appa: A
Son: blink...
Appa: B
Son: C..Dhi
Appa: E
Son:Eff
Appa: hmm
Son:G
Appa: hmm
Son(in a finishing tone): Nunn... (i.e. ten)
Son: Yeeeeah........(with clapping hands)

why does a week have just one Sunday?