Most people myself included run it for 4-5 weeks and stop. D-bol loses a lot of efficacy after 6 weeks. That doesn't mean it stops working after 6 weeks but the results aren't as pronounced as they are in the first 6 weeks. Plus, D-bol is a 17aa steroid. Prolonged use on any 17aa has detrimental side effects to liver values and a shut down of the HDL (the good cholesterol).