Table:
text: Charlene Choi
Filmography
Television
Year_ Title Role_ Network Notes_
2004 家有寶貝 Ah Sa  Guest star
2007 Colours of Love , 森之愛情 Wai-fong / Ching-lan TVB 
2007 Life Off Stage   
2010 Calling for Love! , 呼叫大明星 Chen Dexin CTS 
2011 The Legend of Swordman , 劍俠情緣 Tang Xiaowan / Ning Xin  
2012 Happy Marshal , 歡樂元帥 Little Dragon Girl (Xiao Long Nu)

Question: How long did it take for Charlene Choi to appear on the cts network?