do a search on posts from realgains. he talked a lot about short cycles. i wouldnt do 4 week on. that kind of ruins the main point of a short cycle. i think you should be fine with either 1 or 2. i cant remember about the clomid/nolva. do a search and you will find all your answers. there was a a thread titles short cyles started by realgains that was about 5-10 pages long. long read, but worth it.