Deca usually start to work around week 5-7 depending on quality of your product and your body. Everybody is different but 5-7 weeks is normally how long it takes to start to see Deca working. However, your joints should already be experiencing some relief from all the lube you're giving them. This is one reason why I prefer to use NPP - 600 mg is my number when it comes to NPP. Love NPP, Test, and Primo (sometimes switch to Masteron Prop, if I'm around 10-12% bodyfat) and Anavar.