I did the RSPH Level 2 course at Datas several years ago (and passed)it was said then that it was a two week course crammed into one week....very intensive.
Two points to bear in mind (1)It costs the thick end of a grand, if you ain't commited - don't waste your money (2) As Matt said it doesn't turn you into an instant pest controller - that takes time, experience and further training .
I don't want to put anyone off doing this course but I think many go into it with thier eyes closed or with a 'Grime Fighters' vision of what pest control is all about. Don't be influenced by the tele, try t