how many seasons does it have?
Seven seasons
30 Rock
Season seven continues to develop the relationship between Liz and Criss
what is when it rains, it pours (30 rock)? It is an episode of the  fifth season of the American television comedy series "30 Rock". when did the conception of this series started? 2002
wiki:16051306
30 Rock [SEP] Season seven
"30 Rock" returned for a final, abbreviated season consisting of 13 episodes, which began airing on October 4, 2012. Alec Baldwin reportedly approached NBC and offered to cut his pay for "30 Rock" to be renewed for a full seventh and eighth seasons, stating on Twitter: "I offered NBC to cut my pay 20% in order to have a full 7th and 8th seasons of "30 Rock". I realize times have changed." Season seven continues to develop the relationship between Liz and Criss (James Marsden), as the pair tries for children and considers getting married. Meanwhile, Jack attempts to improve his future prospects at the company, first by trying to "tank" NBC and convince Kabletown CEO Hank Hooper (Ken Howard) to sell it, and later by plotting to discredit Hooper's granddaughter and future CEO, Kaylee Hooper (Chloë Grace Moretz).